I have recently fitted a quicksilver "supersport" cat back to my R53 S. I love the sound it makes at certain revs but its very very raspy when accelerating hard, is there any way of reducing the amount of rasp?
Also, I've noticed that at around 5500-6000 rpm if you give it full throttle the exhaust whistles!!, should it do that too? Tell you what though, since fitting the exhaust, aside from the strange whistle it defiantly has alot more top end power I'm not imagining it!
I also have the GRS intercooler and a to-be fitted 17% pulley (which should have gone on at the same time as the exhaust but the garage couldn't get the old pulley off!,yes I did supply them with the removal tool)
Check all associated fixings and check where all pipe-work joins. They are good exhaust systems we have only 3 Quicksilver exhaust systems left at £249(INC VAT). These remaining exhausts are all the "Supersports" systems. Two of the systems are twin oval the other is large single oval.
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