I am trying to decide what to buy next for my 03 G35 Coupe.
Currently only have:
Z-tube/K&N Drop-in
Clear Corners
06 Projectors
20% Tint

I want to spend around $600 and was looking at MD Art Pipes, but was wondering if it would be worthless to get them with a stock exhaust? Will I see the same gains that people get with aftermarket exhaust? I do plan on getting the motordyne shockwave exhaust, but it will be a long time from now...I plan on getting rims/tires and coils before exhaust...

I plan on getting 5/16 Copper iso Thermal spacer as well right after I get art pipes. Or is it better to get the spacer now and then get the art pipes when I get the exhaust? I want my exhaust to sound better but also want some sort of performance gain...

Or any other recommendations are welcome...

Thanks for any help!

 

I think you should get the spacer first, ART Pipes after. You'll have more air going through. You should still gain similar results even with the stock exhaust, since the stock cats are the restrictive part of the exhaust.