Since I checked this thread last I discovered the SuperSprint sells headers for the car. That's the route I'd go. I don't know any company that does as extensive testing as them (pretty sure they make the most power in every application they compete in) and their fitment is always spot on. Pricier, but... good things are worth paying for.
MMW's other products are for Scions
Quote:
Originally Posted by flinchy
As far as im aware the n52 has 4 cats, 2 in headers and 2 secondary just after at the start of the midpipes?
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Correct. So your car won't even be overly stinky if you do headers.
I also noticed, while looking at my brothers N52, that not only are the cats in the "headers", but the "headers" are actually collectors. Collectors aren't great, cats close to the engine aren't great-- I'm more confident than before that there's some real power to be had from headers.
It wouldn't surprise me in the slightest if people start regularly getting 295 (crank) HP from 128i's with 3 mods:
1) DISA valves
2) Good headers
3) software that enables the valves and retune for the headers.
My math is as follows...
130s and 330s make 265 hp from the same engine with the DISA valves, so 265 is pretty much a given. 295 requires 30 more, which seems like a lot... but the OEM collectors/cats really look like a crappy design. I actually think 30 is a safe bet.
And, as an extra margin, software companies claim ~10-15 hp from a tune. So, maybe more.