It all depends on witch Evo and turbo evo 8/9 can push more on stock blocks than the newer evo 10's.They can make 400-500whp depending on witch turbo they choose ,500whp would be pushing it on a stock block evo 8/9.I have a friend that has a evo 8 build motor 550whp low boost just for the street on a 35R turbo his high boost is 725whp.There isnt even a 370z that has even come close to making that much power.

The Evo has been around forever though, we will get there. Also, I kinda disagree that a lightly modded evo will keep up with a 400whp 370z. Lightly modded is probably like stage 2, maybe 350whp. I've been in many evos at varying stages of power. Driven them stock, stage 2, and with a 30R and 450whp. I think It would be a nice race with a 30R evo8/9 and a SC 370z. Of course they can ramp up the boost, but they still have pretty bad lag from the 2.0. Hell they lag bad even with the miniature stock turbos.

If the GTM S/C claims 550 hp, wouldnt that add up to more than 400 whp on the car? just curious but I thought the conversion was roughly 15% from fly to wheels....

My budget range is only up till the S/C kit. The turbo kit is out of my budget. Currently I'm on 316.5 whp with HKS exhaust and custom test pipes. My goal is to reach at least 400whp on my 370.

I'm curious how the conversion is with the hp and whp. I know it's different for auto and manual transmission.

You are correct that drivetrain loss is somewhere between 15% - 17% on a manual transmission Z. The big part you are missing is the torque difference between a tt and sc Z. The hp numbers are similar but the sc makes power higher up in the rev range. TT makes power in the middle of the power band and makes more torque.

HP = (Torque x RPM) / 5252

In general torque is king in a drag race. HP comes in to play at top speeds. In short if both a tt Z and a sc Z have 550hp, the tt Z will have more torque and be faster in a straight line. The benefit to me of the sc is that the power curve resembles that of a stock Z and retains driveablity on a road coarse.