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Discussion Starter #1
According to NASIOC
"Which exhaust diameter is best? Exhausts have 3 diameters:

1. 2.5": Good for 300-350 HP
2. 3.0": Good for 500-600 HP
3. 3.5": Good for 600HP +"

I have a spt catback at the moment and wanted to know if i should buy the cobb dp or get the helix dp w/ highflow cat with a g200 Invidia catback.
Will the Spt cb/cobb dp effect performance due to the use of a taper?

I love the sound of the g200 but i'm afraid of drone

I plan to push 350-400whp at some point.
Thank you
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