[CobraMarty]

So do I install the aFe 2.5" mid pipes that also do the secondary cat delete? I heard they add 7hp and 2mpg.

or save up for PE add 3hp and leave the stock mid pipes?

For commuter car so really don't need the beautiful PE sound. Just want better mileage and slight bump in performance.

If I did the mid pipes first, I would probably add the PE next year and vice versa.

[Mike.]

Originally Posted by CobraMarty

So do I install the aFe 2.5" mid pipes that also do the secondary cat delete? I heard they add 7hp and 2mpg.

or save up for PE add 3hp and leave the stock mid pipes?

For commuter car so really don't need the beautiful PE sound. Just want better mileage and slight bump in performance.

If I did the mid pipes first, I would probably add the PE next year and vice versa.

Having had a secondary cat delete and the PE (and both at the same time) I think the best sounding was the PE.

Performance was the gains are negligible but if you want gains then the mid pipes

[Dan Bilzerian]

Isn't doing the PE mod pretty much the same thing as the actual PE? Then just add the aFe pipes

[CobraMarty]

PE mod?

[jc5988]

PE =less weight, sound, ?hp
Mid Pipe= more sound below 4500rpm, 4-7hp dyno tested.

most back pressure are created with main and secondary cat, reduce back pressure at muffler does not help much unless get rid of cat first.

so i will try mid pipe, its much cheaper to start also.

MPG wise it is best keep everything stock, with mod you will just wanna step on it more

[rick100]

Originally Posted by CobraMarty

PE mod?

they remove the original muffler , modify the internals to be the same as a PE muffler and put it back. Cost is around 250-350 depending on the shop

Sound wise , most people say is the same , some say its slightly different

[Zajac1]

7hpAfe midpipe ?? Anyone checked that on dyno ??

[jc5988]

Originally Posted by Zajac1

7hpAfe midpipe ?? Anyone checked that on dyno ??

yes dyno tested

[CobraMarty]

Thanks everyone.
I think that I will get a set of aFe Mid Pipes and put them on my son's 328 as he already has the PE installed. His exhaust is already cut so it should just bolt in. Then probably put a set on my 328 after I get a good baseline for it.

[CobraMarty]

Ordered a set of the aFe Mid Pipes from Bimmerworld for $359.10 ($399-10%) free shipping and no tax.

[The Nightman]

I have both AFE midpipes and BMW PE. I installed both at the same time so I don't have a direct comparison, but I believe the larger diameter of the midpipes gives the exhaust a slightly deeper tone compared to the PE alone, based on sound clips.

The midpipes were a bit long and pushed my PE too far back. I had to trim the PE Y pipe (where it connects to the midpipes) by an inch to get the tips where I wanted them.

[hongsc]

$360? Prices have gone up. I paid $250.

[mike@x-ph.com]

3 and 7 HP are both within the dyno margin of error.
Highly doubt you will notice any power increase with either exhaust