Dave - I love those mufflers, I have them on the 550i. They sound sick.
That stock exhaust is different then mine. Ours has a dual muffler system on each side. What year was the M5?
The system you designed is basically what we are going to do just with some additional hardware. Was the car chipped when they dyno'd it? Intake?
My 550i was super sensitive to not running any type of cat or x-pipe, we actually lost a good amount of torque when we removed the cat. When we added high flow cats, and a similiar x-pipe, we gained 14 whp. When it ran just an x-pipe with no cat, we lost 26 foot pounds of torque and gained about 16 hp at the top of the power band.
Adam, yes those magnaflow mufflers are awesome, I have used them on all sorts of cars, magnaflow really does make a solid product.
That car wasn't an M5, it was a M6, I think it is an '06 or '07? Not too sure, I think it is the same 5.0l V10. Does the 550i have the same engine as the M5 too?
The M6 was not chipped, nor do I believe it had any additional hardware. I know it was dyno tested before the exhaust, and I do think it was tested afterwards, but with some other modifications, I didn't do the testing myself, nor did I ever see the charts anyways.
I've found with modern engines equipped from the manufacturer with some sort of balance between the the banks often respond better with aftermarket exhaust that are likewise, up until the point of proper re tuning of the engine management.
I'd really like to see your results from the anti reversion chambers so far down the exhaust stream, I've never seen them placed like that, but I think they are close enough to the headers to still have a positive impact.
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Topic: Anti reversion chamber fab (Read 30175 times)