so I have a 1999 Trans Am A4, mods are 1 3/4 long tubes, 3 y pipe with 3 inch piping all the way back and SLP resonator, SLP lid, mild cam, stock LS1 intake, chris1313 ram air kit. Cars already tuned and it made 376-380rwhp. Now I wanna get to the 400hp mark. Will ASP underdrive pulley with OD alt. pulley and a LS6 intake get me to 400? If not what's a good mod to get me there!

 

You mentioned a cam earlier right?

 

 

"Mild cam"? How about some specs? Duration, lift, LSA, advance?

 

 

Like I mentioned in the other thread it may or may not make 400 hp. It's going to depend on the dyno among other possibilities. Best advice is don't get caught up in a particular number. Assuming the parts are installed right, they will make whatever number they make on any particular dyno on that given day. With that said i do think they are both worthwhile mods at this point for you

 

Swap to 243 heads and LS6 intake might get you close.