[jc5988]

i guess cat on N51 is really restrictive, AFE mid pipe probably best mod i can "feel" so far. very nice increase from 4200rpm and up.

RED is ESS tune + PI
Blue is above + PE and AFE Mid Pipe

[SDemetris]

very nice

[bimmerquick43321]

wait so that's 7whp peak gain for deleting the secondary cats only? I understand it's in combination with tune/exhaust, but still

[Mike.]

you mean blue is all the mods? because if red is the case you lost 7 hp, anywho, nice gains and interesting how TQ stays the same

[Taskmaster]

Legit, but I think the tune can be tweaked for better low end performance OR a better exhaust system can be made. Good results either way.

[jc5988]

Originally Posted by Emozoo

you mean blue is all the mods? because if red is the case you lost 7 hp, anywho, nice gains and interesting how TQ stays the same

oops sorry, its reversed.

Originally Posted by TheAxiom

Legit, but I think the tune can be tweaked for better low end performance OR a better exhaust system can be made. Good results either way.

yea, the A/F ratio was different now, just had it swapped few days ago, hopefully adaptation reset will take care of the low end. its a bit weird around 3800rpm, when it actually lost power.

[Mike.]

Originally Posted by jc5988

oops sorry, its reversed.



yea, the A/F ratio was different now, just had it swapped few days ago, hopefully adaptation reset will take care of the low end. its a bit weird around 3800rpm, when it actually lost power.

see what ESS has to say, send them that dyno

edit- I was like, why is he happy?! he lost power!! haha but nice gains!!

[Tim07e90]

I can vouch for the AFE mid pipe. It's a cheap mod and great power. I bought mine for $270 and was allowed to pick it up at AFE.

[StealYourFace]

Ive had the pe for 4the yrs, i still love the sound. Cant wait to get this to wake it up a little, im sure it screams above 4000

[mlifxs]

OP thanks for going to the trouble and sharing.

I wonder what the mid-pipes would do on their own? or sound like, for that matter...

are there any before / after dynos for mid-pipe only or PE only?

[jc5988]

Originally Posted by Emozoo

see what ESS has to say, send them that dyno
edit- I was like, why is he happy?! he lost power!! haha but nice gains!!

kinda interesting after compare dyno on all previous setup, the latest dyno actually has similar tq curve as stock map. bump at 2750rpm and 3800rpm has been somewat restricted.

Green line is the stock map flashed right on dyno the same day, so it did not have much time to adapt back down from the blue line with ESS tune+PI. blue was dyno'd first then green.

ESS told me AF ratio still with in the range, so im gonna have the adaptation reset and see how it goes.

[jc5988]

Originally Posted by StealYourFace

Ive had the pe for 4the yrs, i still love the sound. Cant wait to get this to wake it up a little, im sure it screams above 4000

not just a lil, it VERY noticeably loud now with window down with lots of overun bursting. still aceptable drive slow and no drone.

Originally Posted by mlifxs

OP thanks for going to the trouble and sharing.

I wonder what the mid-pipes would do on their own? or sound like, for that matter...

are there any before / after dynos for mid-pipe only or PE only?

I think for secondary is more restrictive then stock muffler, so you should see part of gain if you just swap the mid pipe. sound should also be louder.

so you should get the mid pipe first if budget not allowed, then the muffler or even muffler delete. but its gonna be VERY loud without any muffler + mid pipe.

[Mike.]

I cant wait to get my secondaries out tuesday!!! (hopefully)

OP, now you need to to a charcoal delete and a ram air intake along with new headers

and you will have a moderately "quick" 328i

[Takeshi]

Originally Posted by jc5988

not just a lil, it VERY noticeably loud now with window down with lots of overun bursting. still aceptable drive slow and no drone.

hmm this is tempting

But I already have secondary cats removed. I wonder if I can still get an increase in sound just from the additional mandrel bent piping. I would imagine I would get a slight increase in horsepower with the smoother piping but I wonder if I can hear the difference through my magnaflow catback. The Magnaflow is probably the most quiet catback system for the N52. I didn't hear that much difference when I did the secondary cat delete on its own.