Hello everyone! I am new to the site and this is my first thread. I have an 85 Z28. It's in great shape with only 56,000 miles. It has a 305 "H" motor in it. I am looking for some advise on some things I could do to get a little more HP. Like all of us I'm on a budget, but I am willing to invest some time and money. I'm not looking for high HP, just something a little more than what I have to make it a little more fun.

 

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it's been asked/answered countless times over many years. They are called bolt ons and you'll find all kinds of opinions and suggestions.

 

Thanks for the response. I have been searching through threads and I think I'm gonna start with a new exhaust. Should I be worried about emissions testing? I'm not sure how far back they go for that. Maybe an intake after that?

 

Check state laws/regulations. Some states test, some don't.

JamesC

 

I checked into my state (ny) regulations. Since my car is over 25 years old it is exempt from emissions testing. Should I remove all emissions. Should I get a new catalytic converter with my new exhaust or just get rid of it.

 

That HO has a carb right? I've seen guys grind the tab for the secondary barrels, so they open up 100%.
You can advance the timing to 10-12*, listen for spark knock.
Get a K&N air filter.

 

start with headers,factory headers are horrably restricting, and gut the cat.should free 25-40 hp same with tq

 

intake, blow-thru carb and a turbo set up!! run 1lb of boost if you only want alittle power

 

The stock HO exhaust manifolds, Y-pipe, and intermediate pipe were as good as if got--IIRC, there were no larger systems. You can purchase a direct-fit Catco high-flow cat. I've read that 5 hp is a common increase in power where after market cats are concerned. 25-40 would be very optimistic on an gutted OE system.

More info about exhaust manifold size and a pic of the HO (L69) Y-pipe in comparison with an LG4 Y:

https://www.thirdgen.org/forums/exha...-question.html

JamesC