You can throw out the idea of a 600 whp daily driver on either car. If that's what you want, you're looking in the wrong place. Buy a GTR, Vette, CTS-V or GT500.

Im just going to think about keeping the z or get another car no big rush just looking for advice before jumping on something thanks for the help guys

will probably be similar money to get 500+hp out of either car. z has a better chance of a stock motor putting up with that power than an sti

I disagree. If you don't cheap out and have a pro do a proper tune there is no reason you cant DD a 600+Whp STI or Z. With that said it will probably cost around the same price to make both cars handle 600 wheel.

If I do end up fi the z I would build the motor and go forged internals but how much power could the z take with forged int and how long would it last?

A fully built motor? GTM built one with close to or over 1000hp. But 600hp wheel on a built motor would be very reliable. Alot of it comes down to the tune. If its tuned properly you wont have issues.

It would be reliable enough for a toy, but I'm still not sure I'd use it as a daily driver. Plus, that motor on GTM's website costs a mint. I'm sure it's worth it, but a 600 whp Z would probably cost you close to 100k (including the price of the car) by the time you got it built and tuned. Personally, if I were going that route, I'd budget $1500 for a craigslist beater to use Monday through Thursday, and just bring out the toy on the weekend. As far as your original question, for 600 whp the Z would be a far better car. A 600 whp STI would have turbo lag like you wouldn't believe.

Please don't think I'm trying to talk you out of doing it. I'm just pointing out that it won't be the easiest or cheapest 600 whp car you could have once you're done and you add up the receipts. That being said, a 600 whp Z would be awesome.

Its all good im just looking for advice and to see what other people point of view is. Im just looking for more power that is it love the z and everything about the car not like im going to jump up to 600whp right away that is just the max hp I would want. Wouldnt mind having 500 or more looks like gtm tt is the way to go for the 500 range just want it to be reliable...should pm them and ask would it be safe for stock internals...I really appreciate all the advice!

You'll be fine at or just under 500 whp (dynojet) on the stock block, assuming the tune is spot on. Budget 15k or so to really do it right. 500 whp is a lot of power. You might find out that you're perfectly content at that level. A turbo Z is a handful.

If you are looking at around 500whp, I'd stick with the Z. Will probably end up being cheaper to hit those numbers with it.

I'm going to second the issues with 400+ whp sti's. I have a couple friends who have had to rebuild their engines and were pushing those numbers.

If you are so obsessed with high hp you might also consider another platform entirely. Higher displacement v8, old supra?

If you plan to track get a Z. If you want good power get a Z and TT the baby. If you want to carpool get the WRX. :icon17:

Think longevity. DD not an issue but why go big power if only a DD? Track duty is high wear so what car at high power usage lasts longer/costs you less to keep the same performance over time?

100k? LOL. Not even close. There are a few 370's and G37's on the Island here running GTM Stg2 TT kits on fully built motors and they did not spend 100k. From what I hear I would have to guess 30-40k for a shop to do it. Talk to GTM cause I know they will tell you daily driving a properly built 600hp Z is very possible.

I did talk to GTM. And then I bought a ton of stuff from them. I'm going from experience, not what I've heard.

Ok, let's do some math. The car cost 30-40k. The turbo kit's about 15. The motors from GTM look to be about 25k. That's about 80 or so, and we haven't touched the fuel system. 2-3k. Probably going to want some wider wheels and tires in the back to handle the power. That's what, another 4k+? Oh yeah, clutch? another 1k. So we're at 77-87k without labor depending on if he bought a base model or touring.

Maybe I'm being too vague. I'll use my numbers. The car cost 40. The turbo kit, clutch, flywheel, etc cost 15k. Another 2k or so in random stuff like springs, sways, endlinks, camber arms, radiator, etc. Call it 5k in labor so the math's easy. So I'm at 62k with a bone stock motor. Add in the 25k GTM longblock, 2-3k fuel system, a good bit of dyno time, etc and we're still not too far off the 100k mark. close enough to it to consider other vehicles that might be able to make 600whp a little easier.