mazdica

Please i need advice!

I will remove my main cat and pre cat and put on custom made resonated pipe (100mmm outer inox, iner 65mm mesh filed with stainles stell wool). I would put on RB downpipe but it is to expensiv 2.5 times more due to customs, shiping, tax..

I will put in one piece which i will conect to pipe leading to engine (will my AUX ports open corect or not)

I will eliminate the pipe going to cat back (will this efect my performance)

Will this resonated pipe make my car more louder since i do not want that (cops are pain in the *** here and giving ticket of 750$ if car is to loud).

Please i need info!!

THX

Omixeo

iTrader: (1)

What year is your car? S4's aux ports open from back pressure from the exhaust, S5's use the air pump.

mazdica

sorry i have 86 n/a so my aux ports are opend with back presure. i know that there is 2 psi back presure neded to open ports but will my upgrade have enough backpresure or not. This custom made part will be made by professional who is producing custom exhausts for rally cars but he doesnt have expiriencess on rotaries.

THX

InsomniacFC

iTrader: (4)

This setup will make your car a lot louder. I have a similiar setup and when my gf borrows my car I can hear her coming a block away. You'll need to rig your ports open if you ever want your high end power again or take them out all together. You'll lose a considerable amount of power below 4,000 rpm (say 10-20 depending on how healthy your engine is) and will make your car lose 5-7 mpg around town. It's not as bad on the freeway, though.

There is an alternative as racing beat makes a header with a bung welded in to replicate the effect produced by the split air pipe coming in from the main catylitic converter which should open up your secondary ports. Although, a new header will make your car a lot louder as well. Maybe your exhaust guy can replicate the effect as well.