Yeah, that's pretty much what I was thinking, too much work for too little gain. XP cam performance would definitely be a good start for me as an enthusiast.

I would 100% be happy with 350 wheel, fastest car I've ever driven is my mom's 2016 Impala, something like 300 crank. I'm certainly not looking to compete or anything, but I love the idea of having a pretty stout blower build in a 20 year old car, something I never see in my local car meets. As a bonus I would also like to smoke all of the ricers

 

I'm late to the dance a few weeks here, haven't been on this board in a while. Is the stock wheel/tire size for your 2003 MC 16x6.5 on 225/60r16? Bumpin96 seems to be very knowledgeable about wheels/tires, as I've read some other posts he's commented on. I'm building a similar power setup (350-400whp) on my 2007 MC SS.

To me, even a 225 tire (8.86" wide) on a 6.5" wheel seems too much. Obviously, I'm wrong as the factory put those on and I know that GM has to have a margin of safety and not maxing out. And a 245 wide tire (9.65" wide) seems even more excessive on that narrow (6.5") width wheel. The Michelin Pilot 4S are showing minimum width of 7.5". I'm running 245/45r18s with 18x8 wheels on my 2007 MC SS, and the 04-08 GP GXPs came with 18x8 wheels and 255/45s on the front. I've seen cars running 275/40s on that same 8" wide rim, and others running the same tire specs on W-bodies with up to 9.5" wheels.

So the general question is, how does one match wheel width/diameter to tire width/aspect ratio? And what would you suggest for my 18x8 wheels?