i'm looking to upgrade my turbo to a gt30 r gt35. i just want to know if the stock internals can hold up to boths of that turbo. plus can my tranny hold up that much of power. i have an 04 sti. i been talking to those guy at jscspeed they told me that i would be fine with the internals and the tranny. but i would like to get some help from you guy that been there befor. any help would be nice. thanks alot.

 

Rule of thumb seems to be under 400 whp with a safe, professional tune on the stock internals. However, a built motor with rods and pistons will surely be a lot safer. The question is how long the stock internals will last with such an upgrade. Surely, the answer is a lot less time than stock. I haven't heard of the tranny going as much as the internals without a built block. The GT30, with a safe, professional tune, should last longer than a GT35R, all things being equal.

Try searching on Nasioc.com or iwsti.com for more learned opinions than mine!

 

Do you have a 30r? I have a 35r that I may be interested in trading.

Mark