I put about 20,000 miles on mine towing with it, never had any issues. I pulled a 80's model chevy single cab longbed 2wd with it and i thought it pulled better than my brothers 06 duramax with my 97 chevy scsb, but the duramax was stock with a tune it would have blew mine out of the water.

 

I have a 2004 ECSB has 300k on it i swapped in a 6.0 lq4 and 226ish cam with an old side mounted whipple with bypassed electronics and 42lbs injectors with my own hptuners tune and a 3600stall.. i have yet to dyno it but im hopping for around 400hp

 

I have an 02 Denali Xl with a Whipple 2.3, meth injection, custom tune, 44 lb injectors 8 psi

I have 80k miles on this setup, pulls pretty hard.

 

Any pics of th setup?

 

You can go to my page and see the pics on my whipple install. Ive found 4 different pulleys for it so far. Right now its sitting at 5-6 psi but i have one smaller pulley i could put on. The thing does get hot though. Even with a air to air intercooler i still see 140-150 degree IAT temps in 95-100 degree weather.

 

What is your intercooler setup? I never seen more the 20 above on my old air to air setup with my kenne bell.

 

3 in tubing to an intercooler mounted directly in front of my radiator. I'm running a 2 5/8 pulley right now. When I pull the temps from my auto cal it's telling me 150 degrees at the end on my quater mile run. Seems high to me as well. Maybe it's the cheap *** eBay intercooler that is causing it or the small pulley im running.