09-06-2012, 04:17 PM | #1 |
Captain
220
Rep 695
Posts |
Aftermarket midpipe to OE catback question
Featured on BIMMERPOST.com |
09-06-2012, 06:14 PM | #2 |
Major
283
Rep 1,017
Posts |
I'm not sure if I fully understand your question but every aftermarket mid pipe I've seen is same diameter and bolts straight on to oe exhaust. The changes are usually the removal of the cats and/or the resonator. Not a change in diameter.
Hope this helps. |
Appreciate
0
|
09-06-2012, 07:55 PM | #3 |
Captain
220
Rep 695
Posts |
This is not the case for Akrapovic. The base OD if their gasket (i.e., at the small end of the taper) is nearly as large as the maximum diameter if the OE flange. No way I'd get a reliable seal.
|
Appreciate
0
|
09-16-2012, 12:23 PM | #4 |
New Member
2
Rep 11
Posts |
It's odd that you have this issue. I found that usually when it's bigger diameter, they end up being tappered down when it gets closer to the flange. Does this happen to your Akrapovic?
|
Appreciate
0
|
09-17-2012, 08:39 PM | #5 | |
Captain
220
Rep 695
Posts |
Quote:
|
|
Appreciate
0
|
10-19-2012, 10:52 PM | #6 |
Captain
220
Rep 695
Posts |
Update: the adapter from Burn Stainless arrived today. I designed the part, sent them the Akra midpipe with a new new graphite sealing gasket, and they fabricated it. As always, their quality was outstanding, with welds that could pass for robotic. Assembly was uneventful, although I'd like to find some springs that will allow me to use the OE flange bolts.
I'll post a sound clip soon, but my initial impression is that cold start, idle, and revving aren't that much louder than stock. Since I haven't actually driven the car, I cannot comment on interior volume at speed or drone yet. |
Appreciate
0
|
10-28-2012, 07:54 PM | #8 |
Brigadier General
116
Rep 3,070
Posts |
Like you've mentioned before what I hear from this clip is not too different than the stock soundwise, just a notch louder. Definitely closer to a N55 mid sound than a Maddad. More burbles.
__________________
"The mark of a great car is one whose overall competence exceeds what you should expect from its individual components and the 1M does just that", Chris Harris.
BMW 1M-SOLD-: TECH: Evolve Race+N55mids, Evolve IC, Michelin PSS, ER cp, aFe filter, CDVx, Vorshlag camber plates, BMS OCC EXTERIOR: trunk spoiler, blacklines, black grills, IND goodies INTERIOR: Alcantara steering wheel, steel pedals, custom mats, MPower e-brake. |
Appreciate
0
|
Post Reply |
Bookmarks |
|
|