i wanna get either a straight pipe or a downpipe for my n/a but i dunno which to get first and which would be better. btw i have an 87 base model it is completely stock except for a k&n air filter(the one where the air pump plugs into the adapter) anyway, heres what im trying to decide on...

http://cgi.ebay.com/ws/eBayISAPI.dl...7947286081&rd=1

or

http://cgi.ebay.com/ws/eBayISAPI.dl...7947812411&rd=1

 

links are broke.

 

lets try this now...

http://cgi.ebay.com/ebaymotors/ws/eB...category=33633

or

http://cgi.ebay.com/ebaymotors/ws/eB...category=33633

hope it works

 

The first test pipe will only replace the main cat where the second looks like it will replace the 2 precats.
If you go with this setup, you will be left with the problem of finding a pressure tap to operate your 5/6 ports. The S4's 5/6 ports open when you reach a certain back pressure in the exhaust system and the pressure tap is on the main cat.
Good luck and happy shopping.
Personally, I went with the Racing Beat Down pipe and Presilencer combo, ya it's more money, But I like the polished stainless.
Karyn

 

oh yeah, that occured to me... i was trying to fin dout what the activation of the 5/6 ports were for though. if i get either of those, will i have to do this? how much a risk is it not to?

 

same as him i'd also go with the racing beat dp pre silencer they have real good quality parts i have a racing beat dp for sale for 86-91 n/a's 2.5''

 

how much?

 

any modification to the exhaust system i would have to activate the 5/6 port? if so i had no idea about that.

 

Here is the link to the Racing Beat setup
Assuming you have the manual tranny.
http://www.racingbeat.com/resultset....rtNumber=16206

 

ahh okay. sorry, im still a noob. as you can see from my title thanks everyone.

 

Go for the Racing Beat DP/PS..... if you haven't bought any of their stuff before, your freaking jaw will hit the floos when you get it and you'll get a woody!!!!

As for your 5/6 ports...... You'll have to get a summit racing RPM switch, a spare vac solenoid, a hose barb and some vac line and run the 6-ports off the air pump output..... look it up its been discussed many times before.. I AUTOMATICALLY do this mod to every s4 i get to rebuild and sell... (cause when you get a car with a clogged cat, beat the guts out of it and put it back on.. you have to make up for the loss in back pressure!!!!!!)