GTM Twin SC. How to not destroy my car?

Originally Posted by 1slow370

don't worry about the little failures it will fail all on its own no matter what you do to it F.I. or not, just gotta deal with it when it happens. The GTM superchargers have always been good quality wise you just need to be fully prepared to wait a long time to get it. Because it is taking so long, and because of the group buy that has been going on for a long time they have gained a lot of negative opinions on the forum, and now all responses about anything gtm are all pitchforks and torches. If you only want to do supercharging the GTM kits have consistently mopped the floor with the stillen kit, but it has taken months for guys to get their kit. So if you choose to order take it slow, do upgrades on the rest of the car in the mean time, and DO NOT take your car apart or schedule the kit install until you get the kit.

Edit: now as for the actual intent of your post if you have a manual the whole clutch hydraulics system is utter garbage and will try to strand you somewhere, especially with a stiffer spring in the clutch, the diff bushings in the rear end want to explode, get an oil cooler with whatever kit you do order, a better radiator also helps. beyond that it is just gauges, and things like meth or e85 conversions. It seems so far that so long as you stay around or under the 550hp mark it will last a while engine wise until some random shiz like blown gasket happens(which also will happen bone stock randomly to unlucky people ask me how I know)

Also take cosmo's opinions about gtm with a grain of salt since he apparently managed to be the only person on GTM's do not sell to list lol.

Originally Posted by ourdelusions

My goal is for 600whp+

So.... along with the SC
New clutch
Better diff bushings?
oil cooler
After-aftermarket radiator
and exhaust

Anything else?

Also, how'd you manage to do that Cosmo?

Originally Posted by dmhenderson

600+ hp on the stock block? Laffo.
You'll put your eye out kid.
HO HO HO

(You are going to blow the motor)

So anyway, without building the motor I would not take it above 550whp. I stopped at 500 to be "safe":
-Oil cooler is a must. The bigger the better.

-I had massive traction issues (1 wheel peel etc) after the upgrade so I sprung for a Quaife diff and some meatier tires (275f/305r) and that solved most of the problem. OS Gaiken makes a better diff but they're noisy and require rebuild periodically.

-Your exhaust is fine but if you want better numbers, you will need something more suited to FI (free flowing)

-After 6 months, my stock clutch is still hanging in there but I can feel it starting to slip in 2nd on occasion so it's on the "probably needs to be replaced at some point" list.

-Get rid of your cats if you can get away with it.

Originally Posted by ourdelusions

Thank you for the advice.

So, going the TT route I'm looking @: Fast Intentions TT kit, headers, and HFC

and somewhere in the 500-575whp range

I'll keep looking into better clutches, and into Quaife. Thanks for the advice.