hey guys..
i was just wonder sence my 5th and 6th are still in working condition, if there was anyway to eliminate my cat and have a straight pipe in the place. and have the line that runs to the airpump to the cat blocked off with a lil hole so it can make its own pressure so they open.. also how many psi does it take to open the 5 6 port? ive done alot of searching..

 

there is really no point in doing that.. take off your airpump.. throw on a straight pipe.. and just wire your ports open.. mine were working.. and when i did this i noticed 0 low end drop in performance

 

so what performance would i see with the straight pipe other then the load noice...?

 

soo ya...

 

keep them working... your 6 ports run off you air pump. you can put any exhaust on you want and they will stick work as long as the air pump is on. the 86-88 ones work off exhuast pressure.

 

i own a 88, so what would i do

 

so how do the s5 work... dont they work off the exhaust pressure?..oh ya...what about the post when someone said that u can keep the 5 and 6 workin with a 2 1/4 straight pipe??? some how i dont believe that..ill wire them open if i have to.. but on the other hand that would be cool if u can get them to work with the sp

 

would i have to run the line from the ari pump to the cat?

 

86-88
http://homepage.mac.com/jburger/jaysrx7/6PortSolution/
http://home.earthlink.net/~burntoast/6port.html

 

how about s5 write ups?

 

S5 aren't controlled by exhaust backpressure. S5s NAs use the airpump via a solenoid switched by the ECU.

 

how would i beable to have the the airpump open up the ports?

 

In your sig you have a 90. 89-91's came from the factory using the airpump to open the 5th and 6th ports. just put your straight pipe on and if your ports are working correctly now they will continue to with the straight pipe.

 

I would go with a bonez racepipe good quality and good show....

 

thnx, black7... thats the kind of awnser i wanted to know..