Thinking of installing these URD equal length headers as soon as I pass my next Air Care in Sept as this is the last year they will be doing air care testing in British Columbia. I have a few questions which some of you more experienced engine modifiers may be able to help me with.
1) How much of a power and MPG gain can I expect from these long tubes approximately?
2) Since they will be eliminating the catalytic converter build onto the stock exhaust manifold I'm wondering how much louder the exhaust will be if I maintain the stock resonator and muffler?
3) Are there any other parts I need to buy to make this work after taking off my stock exhaust manifold (i.e. the wire that attaches to the old exhaust header, or something to prevent the engine light from coming on.
Thanks for any tips you can share as I am new to this forum.