I'm not trying to restart a war here, but here's a link to a small amount of info regarding this argument. BTW I use a bell 995 and I'm very happy with it.

http://www.radarbusters.com/support/product-tests/3.asp

Vinny 2000 T-RED CSVT MODS: 18" REV model 2 ST200 struts/Roush springs CTA intake Pipe/K&N Filter Dtec Heatshield Optimized TB True Duals w/ magnaflow mufflers/resonators