Just looking for performance mods (already happy with my suspension/looks/etc.), but is there anything else I can do to improve NA performance - w/o going FI. Here is what I have:

Injen cold air intake
HKS Hi Power true dual exhaust w/ Ti tips
Motordyne MREV2 lower plenum and 5/8" spacer
Osiris tune
TopSpeed Headers
Helix High flow catalytic converters
KJR lightweight crank pulley

The original owner modded the car several years ago (2005 Coupe). The motordyne ART pipes sound tempting, but will the gains be noticable over my HFCs? Any other suggestions? With a 2-3k budget is there anything I can do to squeeze a little more power out? Don't really want to build the engine internals yet as it runs great and only has 28k miles. Thanks!

 

Lightweight flywheel would help, but it's a bit of a waste to dig in there when your clutch is still ok. But I'd swap it out when your clutch goes out.

For 3K you could get cams installed and the engine tuned - that would definitely give you a bit of a boost up top. Properly done, Nismo cams shouldn't hurt the reliability at all.

 

Being the proud owner of the HKS HP exhaust you must be aware of the restriction in the crossover. Time to replace the crossover with Magnflows x-pipe. Mine had 1/4" restriction in the right side and over an inch in the left. If your Ingen intake is metal replace it with Stillens CAI and bring air from the grill via scoop and tubing to the giant K&N filter. Year round increase with no loss of power in warm weather....Gary

 

If ur really lookin for power from na. I would gut the interior, saves a lot of weight. Or u can get a new car lol, our motors are expensive as hell to work on! Im in the same boat pretty much have every na mod and im leaning towards fi now!

 

Impressive mods my man. Can't believe you went the extra mile and already installed the headers. What a pain to install. I guess i can reconmend a grounding kit.... benifits may be none but they look racey

 

Your pretty much done short of head work and cams.

 

3.7 FD gears, aluminum or cf driveshaft. And yes, going from HFC'S to ART pipes will be noticeable. Especially with all the extra torque in the lower rpms.

 

^what he said, are you RevUp? if not, you'll need cams to get your money's worth out of those headers

 

Thanks for all the replies, yes it is rev-up. Looks like I have some more ideas and items to research a bit more!

 

for the 3k get the art pipe big difference over hfc or tp's , x pipe , maybe go back with the stock rev up box and knn filter also some weight reduction light weight battery, gutt the trunk if you dont mind the looks and gives alot of extra space , alminum driveshaft since your 6mt 3.9 or maybe the 4.08 gears will make a big difference but youll lose mpg !!! or just get the 3.7's also get a catch can alot of people say for looks but it does help out ...

 

After you get whatever youre getting. For fun you can get a throttle body spacer and a engine torque dampener.