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Catless Downpipe Reviews - Tolerability and Performance
I recently installed the MMP catless downpipes on my N54 E88 after some debate and wanted to share my impressions. My car has a 5" stepped FMIC, stock intake and exhaust, and runs a Cobb off the shelf tune. Here goes.
1. Tolerability
I was on the fence about catless downpipes as I was not willing to tolerate a lot of smell or noise, regardless of performance gains.
I am happy to report that smell is quite minimal once the car warms up. I was recently stuck in traffic with the roof down and at one point got a slight whiff of gasoline smell. I'm pretty OCD about these things and I can say the smell is NOT an issue.
In terms of noise, there may be a slight increase in exhaust sound but the big change is how much you can now hear turbo spooling. It's a sort of whistle like whoosh sound with a metallic component to it. My friend likes it. I find it annoying as it muddles the previously beautifull exhaust note. I'm mostly indifferent to it after a few days now but definitely don't see it as a plus.
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