At least, new to me. My old second gen was a '91 N/A. I put 100K on it and I bought it at 100K. Only put one engine in it. Hit some standing water in the road, spun around twice and put me in the ditch hard. So I let the insurance total it. Took everything off it I could.

Bought a '87 N/A. New paint job, new engine, 85K miles. Runs great but now I've got to learn all about S4's. I had gotten up to speed on the S5's. Oh well.

 

My first S4 question....the secondaries operate on exhaust back pressure in an S4. If you put a cat-back exhaust system in it, like 2-3" piping, will this foul up the operation of the secondaries?

 

No, it will not.

 

have u noticed much of a power difference between your S4 and S5?

 

First, thanks, J-Rat.

Second, yes I have noticed a difference. I had cat back exhaust and cone intake filter in a cold air box in my S5 and it would definately keep up with the traffic. I plan to do the same in the S4, but its starting out with less power.