Downpipes?

[iamwingman]

Hi all. I've never messed with downpipes, but I'm considering going that way (akrapovic with delete r). What are they like living with day to day? Are they very much or just a little louder? Do they void any part of our warranties? I'm also considering the dinan tune. Would the dinan tune take care of lights, so I don't need delete R? Bottom line, are they money well spent? Thanks....

[Kevlar]

Noise will increase... performance will be worth it especially if you are going to add a tune which will raise boost. When you change any part on the car, BMW will void the warranty on that part and any part that is affected by that part. So your exhaust warranty will be voided but your air-conditioner warranty should be fine (as an example). DINAN parts come with their own warranty which some dealerships I think still honor, but it will be between BMW and DINAN to figure out who pays the bill.

On a vehicle equipped with a turbocharger, an after-market downpipe can offer a significant improvement in performance. Because a turbocharger is essentially a pump, it’s important for the pipes entering and exiting the turbo to have unrestricted airflow. On many turbocharged vehicles, the exhaust pipes coming in and out of the turbo contain numerous bends. If these pipes are bent using a cheap, crush bending process (a common situation for many vehicles), they can restrict exhaust gas flow in and/or out of the turbo.

By reducing exhaust gas restrictions, the turbocharger can spool up more quickly. Faster spool-up times mean more power and/or better fuel economy. As a result, many after-market exhaust manufacturers offer over-sized exhaust downpipes with mandrel bends.

You might want to buy an after-market downpipe if:

The exhaust piping leading in and out of your turbocharger contains numerous bends. Some vehicles – like large turbo-diesel trucks – have enough room in the engine bay for fairly straight exhaust tubing. Smaller vehicles can have a lot less room in the engine bay and therefore more pipe bends.

You’ve modified your turbo to run at a higher boost pressure. Some turbocharged vehicles come with a well-designed turbo exhaust system, and in these cases there is very little to gain by adding a new downpipe.

However, if you increase the amount of boost on the stock turbo, you may find the increased exhaust gas output demands a larger, smoother downpipe.
The after-market downpipe is proven to improve performance. Most after-market downpipes are both mandrel-bend and larger in diameter than the stock units they replace. Therefore, they can significantly reduce restrictions and make fairly dramatic improvements in horsepower. Adding a downpipe to an older Subaru WRX exhaust system, for example, can add as much as 40hp all by itself.

Subara WRX’s aren’t the only types of vehicles that benefit from downpipes. Despite having fairly efficient and well-laid out turbo exhaust systems, many late-model diesel pickup owners can add 10-20 hp with nothing more than a new downpipe.

Bottom Line: If you own a turbo-charged vehicle, it’s wise to research your downpipe options. Just be sure that you see a dyno test demonstrating a significant performance improvement before you buy.

http://www.exhaustvideos.com/faq/wha...ld-i-want-one/

[GOLFFRR]

I would highly recommend you get some sort of valve control module if you go with DPs. All the valve control modules on the market right now will get rid of the cell so I would skip the akra delete IMO and spend that money on a valve control

DPs will make your car a lot louder with valves open but in a good way however for me its gets old quick so its nice to have the option to close the valves and keep the car more civil

Sound is all subjective so its impossible for someone to tell you if its great for you or not. You will need to hear it in person but yes it will be a lot louder. I don't believe dinan piggy will get rid of the cel but I could be wrong.

always mod at your own risk

[iamwingman]

Thanks. Tons of good info there..

[ES_TRADER]

Originally Posted by Kevlar

Noise will increase... performance will be worth it especially if you are going to add a tune which will raise boost. When you change any part on the car, BMW will void the warranty on that part and any part that is affected by that part. So your exhaust warranty will be voided but your air-conditioner warranty should be fine (as an example).

by this logic, the engine and/or turbos is affected by the downpipes aswell. Does that mean your engine warranty will also be void? exhaust is definitely a key part to the engine.

[Mike@N54Tuning.com]

Downpipes (as long as you have stock exhaust) will not drastically increase the sound, but will make the exhaust sound deeper and more throaty (best way I can put it into words) There will be an audible increase, but the biggest change is the tone. Very intoxicating.

Good advice above to have the ability to control the exhaust flap, either with standalone units like the BMS CanFlap or the EAS unit, or with a tune like the JB4 that has that feature built in.

Mike

[///M ARMY]

Originally Posted by GOLFFRR

I would highly recommend you get some sort of valve control module if you go with DPs. All the valve control modules on the market right now will get rid of the cell so I would skip the akra delete IMO and spend that money on a valve control

DPs will make your car a lot louder with valves open but in a good way however for me its gets old quick so its nice to have the option to close the valves and keep the car more civil

Sound is all subjective so its impossible for someone to tell you if its great for you or not. You will need to hear it in person but yes it will be a lot louder. I don't believe dinan piggy will get rid of the cel but I could be wrong.

always mod at your own risk

I do agree with your statement only if your running a aftermarket exhaust. That is just a personal preference. Personally, Stock exhaust with DP sounds amazing with the valves open all the time. Now with an aftermarket exhaust it does sound good as well but for the people what want no drone or to control the valves, having that is a good option. There are a few valve control modules on the market but I see the JB4 as the best bang for the buck. But that's all based on personal opinion. The development with the JB4 continues to grow and grow each month unlike other tuners on the market.

[GOLFFRR]

Originally Posted by ///M ARMY

I do agree with your statement only if your running a aftermarket exhaust. That is just a personal preference. Personally, Stock exhaust with DP sounds amazing with the valves open all the time. Now with an aftermarket exhaust it does sound good as well but for the people what want no drone or to control the valves, having that is a good option. There are a few valve control modules on the market but I see the JB4 as the best bang for the buck. But that's all based on personal opinion. The development with the JB4 continues to grow and grow each month unlike other tuners on the market.

side note don't want to thread jack but still waiting for your post saying your going to attend the meet in March!

ok back on topic. Sorry OP!

[singh21]

How much louder is stock exhaust with flaps open vs stock exhaust with valves open WITH catless downpipes?

[mike@x-ph.com]

Originally Posted by iamwingman

Hi all. I've never messed with downpipes, but I'm considering going that way (akrapovic with delete r). What are they like living with day to day? Are they very much or just a little louder? Do they void any part of our warranties? I'm also considering the dinan tune. Would the dinan tune take care of lights, so I don't need delete R? Bottom line, are they money well spent? Thanks....

As explained above, for the performance gains it is definitely worth it.
Sound increase will not be obnoxious, it will be deeper tone ( exactly how a daily driver should sound)
I recommend that you get a JB4 too in order to get maximum power out of the DP. It will also clear the CEL code for you.

Originally Posted by singh21

How much louder is stock exhaust with flaps open vs stock exhaust with valves open WITH catless downpipes?

As mentioned above, adding a DP will not make the car sound obnoxious or really loud.
Car will sound sportier for sure.

[GOLFFRR]

Originally Posted by singh21

How much louder is stock exhaust with flaps open vs stock exhaust with valves open WITH catless downpipes?

here you go

[Gac101177]

Originally Posted by mike@x-ph.com

As explained above, for the performance gains it is definitely worth it.
Sound increase will not be obnoxious, it will be deeper tone ( exactly how a daily driver should sound)
I recommend that you get a JB4 too in order to get maximum power out of the DP. It will also clear the CEL code for you.

As mentioned above, adding a DP will not make the car sound obnoxious or really loud.
Car will sound sportier for sure.

Will the BMS valve module clear the cell with downpipes for someone that does not want any tune like JB4 for now.

[TunedM2C]

It will sound similar to this:

http://instagram.com/p/y-JmPlCbIb/

[BMWJ]

Originally Posted by ES_TRADER

by this logic, the engine and/or turbos is affected by the downpipes aswell. Does that mean your engine warranty will also be void? exhaust is definitely a key part to the engine.

It certainly could be. One thing you won't want to find out the hard way.

[Daft]

You should also consider high flow CATTED downpipes.

[singh21]

Sounds much louder!

[supremepower]

We have the downpipes by Evolution Racewerks on our car. It's highly recommended for the F8x! It increases the sound and gives the stock tone a much deeper, and throatier idle and when on the throttle.

The available solution to the CEL is the P1 gauge, Akrapovic Delete R, and Macht Schnell EVC module.

PM if you need any assistance!

[ES_TRADER]

Yeah and then with downpipes you need a tune and that tune controls the engine so basically if your engine goes then they can blame the tune. I'm want dp but man not sure it's worth the headaches. Maybe after warranty is up and I still care about this car.

[ES_TRADER]

Originally Posted by Daft

You should also consider high flow CATTED downpipes.

Do these also require a tune?

I heard the catted ones dont make much difference than stock

[Kevlar]

Originally Posted by ES_TRADER

Yeah and then with downpipes you need a tune and that tune controls the engine so basically if your engine goes then they can blame the tune. I'm want dp but man not sure it's worth the headaches. Maybe after warranty is up and I still care about this car.

Even without a tune... down pipes could cause more flow, more flow means more boost pressure which could cause engine problems from higher than specified boost levels or air box problems or turbo problems. Even if the down pipes didn't cause more boost, they could say just their presence means you might have installed them incorrectly damaging key components in the process.

It all depends how hard you want to fight after they tell you your warranty is void because you installed a non-factory approved part.

[Mike@N54Tuning.com]

Originally Posted by ES_TRADER

Do these also require a tune?

I heard the catted ones dont make much difference than stock

Catted pipes produce less gains then catless, but much more then stock. I usually say if catless gives you a gain of 25-30 then the catted will do 15-20 or so.

The other issues is that catted still require a tune or some form of CEL delete as they will still most likely throw a code (eventually)

Mike

[NorCal f80]

Originally Posted by GOLFFRR

I would highly recommend you get some sort of valve control module if you go with DPs. All the valve control modules on the market right now will get rid of the cell so I would skip the akra delete IMO and spend that money on a valve control

I don't think the BMS gets rid of the CEL. It only clears it but it will come back?