Mine was built by Comp turbo, CR performance does it too.
they machine the stock turbo to accept a bigger compressor wheel. It better matches the power band of the engine.
The bigger compressor wheel really is a great upgrade as long as you can get properly tuned for it. The 57mm wheel is a little too big for a gas truck but works great with e30.
the next stage down is excellent for 91-93.
Wheel upgrades are easier on the engine at low rpm because they don’t fly...
You aren’t making anything near 725hp
The stock engine will usually let go around 500 crank hp. It would take some serious work to make one that can handle that.
The stock transmission does just fine for handling power. My truck makes around 460hp at the crank and the stock transmission has...
Unless you’re trying to make over 350 wheel horsepower then it’s not going to be a factor. Pick the one you like. Injen makes more noise but some people have a problem with it because they are afraid of hot air ?
The S&B is amazing, I was even visited by their rep at our shop yesterday, they...