1990 IROC-Z
N10 - Dual Cats

I was looking at a pair of SLP 1 3/4" Headers, a PAIR of Catco 2 1/4" Converters, and a Flowmaster 3" American Thunder Cat-Back System. I was curiuos about joining it all together... Will the Headers come with the pipes to 'link' to the Converters? Will the Flowmaster Cat-Back come with a pipe to 'link' to the other end of the Converter or will I need to purchase a Flowmaster Y-Pipe?

This looks to cost around $1,000... Anyone have any ideas concerning how much HP or Torque will be gained... or what results it will have on 1/4 mile times?

-Thanks

 

I picked up 30 RWHP from headers and Random Technolgy Catback exhaust. I tested it with a Flowmaster muffler in place of the RT muffler and lost 8 RWHP. Still a 22RWHP gain over stock. This is why I am not in favor of the Flowmaster. They are too restrictive.

 

I am curious though, if you would have seen an 8HP loss with the ENTIRE Flowmaster catback instead if just replacing the muffler??