I did a check and there's alot more headers available from some really reputable companies. I was wondering because they say the WRX/STI that they will fit both. Also I am wondering if they will all cause me to loose the Boxter Rumble.
Equal length header will cause you to loose the rumble as for Unequal Length header which is on the car now keeps the rumble. I believe most headers will bolt on direct because we have the STi oil pan and the 02-04 didn't.
i have a perrin equal length header and i love it...the power feels alot better but i cant tell exactly how much because i installed a perrin tmic and turboxs dp all within 3 days.... but it comes on alot sooner w/ just the header..i could tell that... it is equal length though so my car sounds nothing like a subaru...but not nearly a normal "ricer sound"....my car feels like a rocket in 2nd when i accelerate from 3 grand as compared to before the header...and keep in mind stock tune also... i am still waiting on the tactrix cable...but i would suggest equal length for power...unequal keeps the sound and yields some small forms of power but equal length is normally a better power adder
DC sports, Borla, and Kakumei have unequal length header which will give your car the Boxer rumble you are looking for. The design of any 3 is much better than the stock manifold. There might be more unequal length header out there... we should start a list and have the moderators sticky it.
ill get a sound clip tonight before i take it off...btw its for sale..i dont have it listed but if anyone wants it pm me..its a perrin equal length...reason i want to get rid of it is i need an accessport bad and need the money for that