What are some things I could do to improve the HP of my 2003 grand prix GT?

[ZK48]

I want to improve the HP of my 2003 grand prix GT? My budget is $500. I'm already going to get a K&N air filter and new exhaust bodies. Also what exhaust bodies should I go with, magnaflow, or thrush?

[blueguy]

Exhaust BODIES?

You mean mufflers?

Save your money and leave it stock.

For a GT...and $500.

Headers, HV3, Tuned PCM.

Just buy a cone filter and make your own intake and save your money on that K&N junk too.

Click the link in my signature and READ.

[JoRoW99]

This^ GT's are slow. Ask me how i know.

[Explicit_Spade]

You should be able to gen 3 topswap for around $500.

[JoRoW99]

Lies^

[Odi]

You should be able to gen 3 topswap for around $500.

500 + fluids/gaskets and other little things you might need

[matt5112]

agreed.

Costs so much more.

So much in fact, you MIGHT as well start with heads and a cam in there because you'll want to do it later.

Then you'll need a transmission.


having fun yet?

At the very least, heads rebuilt ($300), headers (300-600) on top of your 500...

Tune? 100-250.

Aeroforce and wideband? $400.

[Odi]

Yeah, no point in topswapping without headers. Knock country.

[blueguy]

This^ GT's are slow. Ask me how i know.

Same.

Trust me.

Remember the DD, bruh.

[NegativeOne13]

agreed.

Costs so much more.

So much in fact, you MIGHT as well start with heads and a cam in there because you'll want to do it later.

Then you'll need a transmission.


having fun yet?

At the very least, heads rebuilt ($300), headers (300-600) on top of your 500...

Tune? 100-250.

Aeroforce and wideband? $400.

Why I decided not to topswap..... and future plans for turbo.

[JoRoW99]

Mine cost me around 3 times that. Ill admit I probably could have done it for less, but i would declare it near impossible to have a good running top swap for 500.