[TrevTrav]

Wondering what kind of power increase one can expect with a mid-pipe, downpipe, and both. Thinking of AA single mid-pipe and downpipes specifically but I imagine other manufacturers will have similar numbers. Thoughts?

Edit - wondering about increase specifically with stock tune.

-Many Thanks

[Chi58]

My baseline numbers full stock was
454whp and 407 tq

With IRL mid and valve controller
459whp and 430 tq

Most single mids should have similar numbers

[mike@x-ph.com]

Originally Posted by Chi58

My baseline numbers full stock was
454whp and 407 tq

With IRL mid and valve controller
459whp and 430 tq

Most single mids should have similar numbers

+1 these are the numbers that we are seeing with the single midpipe

i expect even more HP increase with the downpipes upgrade

[Southtown]

I should dyno mine. Are we saying only a single midpipe will pick up extra power? Not an equal length?

[Info@mad-us.com]

Originally Posted by TrevTrav

Wondering what kind of power increase one can expect with a mid-pipe, downpipe, and both. Thinking of AA single mid-pipe and downpipes specifically but I imagine other manufacturers will have similar numbers. Thoughts?

Edit - wondering about increase specifically with stock tune.

-Many Thanks

Unfortunately, you won't see more than 15whp without a tune. The stock computer will likely just lower boost to compensate for the reduced restrictions.

Originally Posted by Southtown

I should dyno mine. Are we saying only a single midpipe will pick up extra power? Not an equal length?

They should both have some increased in power. I'd bet the singles out perform the equals but not by a ton until the power levels are increased with a proper tune.

[rons e92]

Originally Posted by Info@mad-us.com

They should both have some increased in power. I'd bet the singles out perform the equals but not by a ton until the power levels are increased with a proper tune.

Single midpipes are better for performance than equal length? I've never even really thought about it before, but it makes sense.

Thanks for pointing that out.

[Info@mad-us.com]

Originally Posted by rons e92

Single midpipes are better for performance than equal length? I've never even really thought about it before, but it makes sense.

Thanks for pointing that out.

One bank has 8+ sharp bends while the other bank is pretty much straight.

The single is equal flow for both turbo banks.

[rons e92]

Originally Posted by Info@mad-us.com

One bank has 8+ sharp bends while the other bank is pretty much straight.

The single is equal flow for both turbo banks.

Yeah, it makes perfect sense. I don't know why that's never occurred to me.

You'd never know I majored in physics in college for a year. I guess that's what 4 years in private equity does to you.

I had equal length on my last M2. In light of recently learned information, I will be going single on the new one.

Thank you!

[Info@mad-us.com]

Originally Posted by rons e92

Yeah, it makes perfect sense. I don't know why that's never occurred to me.

You'd never know I majored in physics in college for a year. I guess that's what 4 years in private equity does to you.

I had equal length on my last M2. In light of recently learned information, I will be going single on the new one.

Thank you!

To be fair I think most people go for the equal length because they like the sound and not the horsepower.

Horsepower lovers will tend to go for the x pipe and single.

[BMWM4_SA]

Originally Posted by Info@mad-us.com

One bank has 8+ sharp bends while the other bank is pretty much straight.

The single is equal flow for both turbo banks.

Info@mad-us.com Do you perhaps have a video of the sound ?

[Info@mad-us.com]

Originally Posted by BMWM4_SA

Info@mad-us.com Do you perhaps have a video of the sound ?

Midpipe only ?

[97supratt]

Downpipe + tune = big power

[Info@mad-us.com]

Originally Posted by 97supratt

Downpipe + tune = big power

Tune alone on these cars is big power but the bolts certainly help.

[M_Power Rob]

Originally Posted by Info@mad-us.com

Tune alone on these cars is big power but the bolts certainly help.

Add ons/bolt ons + tune (for flex fuel) is really big power.

[NewToM]

Originally Posted by M_Power Rob

Add ons/bolt ons + tune (for flex fuel) is really big power.

= my ass in a ditch…

[Info@mad-us.com]

Originally Posted by M_Power Rob

Add ons/bolt ons + tune (for flex fuel) is really big power.

Thats MAD POWER

[M_Power Rob]

Originally Posted by NewToM

= my ass in a ditch…

Yeah, suspension setup and the right rims & shoes are a must.

[97supratt]

Originally Posted by Info@mad-us.com

Tune alone on these cars is big power but the bolts certainly help.

Yeah Tune is huge. But those pesky main cats are a bottleneck.

[Bumpinjeep]

I don't know, I'm running the Evolution Racewerks midpipe and crossover pipe. I don't know if there's any more power but my butt dyno thinks that i'm in boost longer. I'm assuming with less backpressure, the turbos spool easier and i'm able to get more useable mid range torque. These are of course simply speculations. I haven't done a pre and post dyno.

[Info@mad-us.com]

Originally Posted by Bumpinjeep

I don't know, I'm running the Evolution Racewerks midpipe and crossover pipe. I don't know if there's any more power but my butt dyno thinks that i'm in boost longer. I'm assuming with less backpressure, the turbos spool easier and i'm able to get more useable mid range torque. These are of course simply speculations. I haven't done a pre and post dyno.

Definitely some gains from the reduced restriction.

[DutchBoysRacing]

https://g87.bimmerpost.com/forums/sh....php?t=2135772

I just posted my dyno numbers with a mid pipe only and BMC filters and basically there were no power gain* (or its within the margin of error for a 465whp car). It just sounds pretty sweet.

Downpipes would be the biggest gain by removing the primary cat. I'm sure there are dyno numbers floating around online.

*
I personally wouldn't consider a 10hp increase over stock (a 2.17% increase) a "real power gain". A really cold day could yield better results.

[Dave07997S]

Originally Posted by DutchBoysRacing

https://g87.bimmerpost.com/forums/sh....php?t=2135772

I just posted my dyno numbers with a mid pipe only and BMC filters and basically there were no power gain* (or its within the margin of error for a 465whp car). It just sounds pretty sweet.

Downpipes would be the biggest gain by removing the primary cat. I'm sure there are dyno numbers floating around online.

*
I personally wouldn't consider a 10hp increase over stock (a 2.17% increase) a "real power gain". A really cold day could yield better results.

Steve Dinan said 11rwhp is what the OEM DPs cost