I have a 99Z28 that is pretty much stock right now but I am ordering an SLP Loudmouth exhaust and a new Y-pipe. Plus the cold air iduction system from SLP. What should I do next. Any ideas? What kind of hp increase do you think I will get?

 

Don't get a Y-pipe until you get headers, unless you're sure you won't be getting headers for a WHILE. The stock Y doesn't mate to most long-tubes.

Headers, converter if it's an A4, maybe gears if you can live with the fuel economy loss. And make sure you have the suspension/tires to put it to the ground (Subframes make a good mod...keeps the rattles away, too.)

 

that depends on a lot
1) How much $ do you want to spend
2) Where is the car going to spend the majority of its time Street/strip?
3) How much MONEY do you want to spend

I agree with squirls, gears would be a good choice if its an A-4 a higher stall converter.
Headers also unless the car HAS to remain smog legal, but that goes back to where is the car going to spend most of its time.

 

I would go with gears next, and also suspension/tires... U gotta be able to make use of the power your car has, without worrying about loosing a handle on it..

 

Thanks a lot guys. I really appreciate the advice. I beleive I will go with the gears and suspension. It is mainly a road car but I feel so underpowered and feel like it wants to do so much more. Again thanks for the responses.

 

Grab some sub-frame connectors. They make a huge difference.

-Mike