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      11-02-2012, 11:58 AM   #249
C ///M
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Drives: '07 X3 M-Sport
Join Date: May 2010
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Originally Posted by King mode View Post
You should have a good shop fab a set of dp's that will fit perfectly. If you get dp's for eithier a 335i or 335xi, you will still need to do some fabbing anyway...
You'd be surprised how little modification is needed when it comes to exhaust "dimensions" between 3 series related chassis. Do you have specific experience here or are you just assuming fabrication will be necessary? Don't get me wrong, I've been doing this kind of thing for a long time, and sometimes certain parts just aren't going to cut it and you're better off going completely custom, but again, there is a quite a bit of "play" when working with complete exhaust systems due to motor movement.

In my case, it's going to cost a lot more to have a shop knock out custom downpipes than either modifying other N54 downpipes or just taking some heat to them depending how far off they are to the connecting pipes. Anyway, I have a buddy who is completely able to fabricate downpipes of any way, shape, or form, but I don't really want to bother him with this. I guess we'll just see how it goes.

I'll report back this winter, I was just hoping someone here would be able to go into detail with regard to the differences between the standard and x-drive downpipes and specifically the reason for the differences (ie: transfer case protrudes out in this location limiting ******* etc...
Prototype 2007 Monaco E83 'X3M' | N54 Swap | Dual Cone | VRSF CP & DPs | CXR Intercooler | ER Dual Oil Coolers | Dual 2.5" w/X-Pipe | M3 Rear Exhaust | 20" BC Forged HB05 | Michelin PSS 265 & 305 | F10 M5 & F80 M3 Brakes | KW Variant 2 | H&R Swaybars | TMS Z4M Camber Arms | Z4 Finned Diff | BMW Perf. Grills w/Tri-Color | Custom M Aerodynamics | CF Trim | M Perf. Carbon Shift & Handbrake Knobs | BMW Perf. SS Pedals | M3 Dead Pedal | V1 Hardwired | Int LEDs | Umnitza Orion v4 AE & More