I'm thinking of wrapping the SC piping with header wrap. It tends to get very hot in there after a spirited run. Couldn't hurt right? Anyway, I have plenty of header wrap left, so I'm thinking about wrapping the whole ypipe(WSP)and even the test pipe(WSP)with the header wrap. Would wrapping the ypipe and test pipe affect the performance? By wrapping them, it should be more beneficial than harm right?

 

You will get better exhaust gas velocity because of the higher temperatures. Some say that the wrapped pipes don't last as long because of the heat stress, but I've had my y-pipe wrapped for 2 years now with no problems.

 

Thanks Keith, good to know. Btw, did you went to the autocross this past weekend? I wanted to go, but had to work on my school project.

 

No, to many chores around the house.

 

I have had a custom T-304 exhaust on my Volvo 850 Turbo for 3 years now. There are sections which are wrapped and sections which are not. To be honest, there does appear to be a little more surface rust under the wrapped sections, but it is no worse than some of the rusty areas of the pipe.

As for heat stress, on a street car, you don't really need to worry about it. On a track prepped car, meant to extract every ounce of hp at the price of running dangerously lean, with ultra thin exhaust piping to reduce weight, it can become a problem. But as long as you get T-304 or preferably 409, you shouldn't have to worry about it. T-304 being the most common of austenitic grades, containing approximately 18% chromium and 8% nickel. It is used for chemical processing equipment, for food, dairy, and beverage industries, for heat exchangers, and for the milder chemicals. T-409 being the lowest chromium content of all stainless steels and is also the least expensive. Originally designed for muffler stock and also used for exterior parts in non-critical corrosive environments.

 

Mine has been wrapped for about two years as well and it fine. It also resists rust a little better.