Hi all,
Am new to the forum and have had my 2003 JDM WRX STI just under a week now and already want to start playing around with a few bits here and there.
First of all can anyone recommend an upgrade for the air intake? I personally don't think much of K&N and am looking to replace everything right back to the inlet. Preferably sticking with something japanese so AEM, Apex-i etc. Links will be much appreciated! :)
Secondly, I get a slight "dumping" noise when i let off the accelerator and was wondering if this would be heard more from the upgraded air intake? Replacing the OEM recirculating valve has crossed my mind but again not sure what subaru's respond better to, dump valves or wastegates. I do know that wastegates dont do the turbo much of a favour on any car that doesnt have a roller-bearing turbo though.
Last of all, how many cat's are there in a standard STI exhaust system? I have been told there are two and that one has already been removed on my car but the noise doesnt seem to suggest so. even if it has, can i remove both and replace them with straight pipes? The car isnt loud, just has a nice burble and would quite like to keep it that way!
Cheers
Owen