Quote:
Originally Posted by Obioban
The problem is, it's not as straight forward as that. As in, people on the e46 M3 run 3" mids to replace the stock section. That actually gains them ~45-50 hp, which is huge!
But... terrible for a street setup. While the top end gains 45-50, the bottom end and mid range is completely and utterly destroyed. To the extent that it's completely undoable on a street car.
Bumping the pipe diameter isn't a valid solution, imo. Too much compromise.
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50hp gain sounds reasonable, but it's physically impossible to lower the midrange by THAT MUCH that it would become undrivable... back pressure is bad, period, if anyone says that 'a little is good' they're retarded and wrong
the only downside (well two i guess... ooh make that three) to oversized exhausts is ... excessive noise.. drone (cabin resonance can worsen) and increased (too high even) pollution from exhaust gases.
the high compression ratio of the stock M3 means you literally cannot no matter what unless you REALLY break something (bad tune for example.. or massively oversized cams, but that's a different story entirely), destroy low end drivability... worsen slightly sure, but impossible to totally ruin, will always be in excess of N52 cars at the very least.
Quote:
Originally Posted by Obioban
Further, the headers aren't nearly as simple as you make them out to be, either. Collector design, merge design, pipe length, scavenging effects, pipe routing, etc all make a significant difference.
SS's headers for the e46 M3 are fairly unique-- they use different width piping at different point (they're stepped). As a result, they make about 50% more power than other headers offered for the car (by any company).
Those kind of gains aren't unique to the 46, either-- on the e60, for example, SS headers make around 45 hp. Everything else makes ~30 (basically the result of removing the cats from the system). The only company that matches them is Evolve's headers... and Evolve's are produced by SS :roll eyes:.
SuperSprint is pretty unique-- they help OEs develop exhaust systems, race teams use their facilities to get them most from their cars, etc. I don't think anybody does as extensive or through testing as they do, no has the knowledge base of what it takes to actually make a better exhaust system. There's more too it than increasing the diameter and smoothing the bends, at least if you want to make a system that is better... rather than just moving the power around.
Again, though, I think every header for the 128 will make power, since you'll be eliminating the primary cats (in the headers). Just to varying degrees.
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exhaust gas scavenging increases mileage but reduces power. that's all.
different width piping, yes, i did say that reducing restriction was the number one goal, whether better bends, pipe diameters, smoother merges.. it's all in the same goal, getting the exhaust gas out of there literally as fast as possible.. i did say a lot more than 'smoothing bends and increasing diameter' under the blanket term of 'increasing flow'
i believe that supersprint is very good quality, but in no way could they justify the price of $8000 for the full system in my opinion.
though really, give it another week and we'll see how the MMW headers perform on their own, and likely in combinations with various cat-back systems.. there's what.. 20 that got sold and shipped out this week?
Quote:
Originally Posted by Riley1524
Just watched the videos of the laptorr exhaust and holy shit! Sounds awesome. Would it fit the 128i and where can.it be ordered?
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of course it would, same engine same exhaust pathing as any other (inc the 130i)
i know right.. it is catless though, so it's straight from the headers back with resonators and muffler, if that's a huge issue
a dude sells it on these forums (and E90post), it's 2-2.5k shipped pretty much anywhere, so is nooootttt cheap by any means still.
watch the video for E92 M3 though.. oh wow, just wow
ED: i just youtubed supersprint exhausts on 130i. sounds like crap... exactly like stock but a little less rumble and a TINY BIT louder. nothing to write home about by any means.
muffler sounds like it must be fairly restrictive still (heck, it looks like it, with the stock-like design)
might be better in person, but very average in video :/... after youtubing the stock exhaust sound, stock sounds better in video :/. actually sounds pretty good, i don't get to hear my car fromt he outside often haha