I have a 91-GTA with RPO N10-duel exhaust system. will upgrading to a aftermarket cat back system, be a step in the right direction? or is the stock system adequate.I want to start small on mods,exhaust,I think is the best place to start.

 

CC Rider,
Yes, exhaust is ALWAYS where you want to start, that is assuming your car is in proper tune, runs well and you have done your "free mods". The stock exhaust system is always the most restrictive part on almost any car and a lot of horsepower can be freed up if you open up the exhaust.
I frequently tell people that if you only have the resources to do one part of the exhaust at a time, always start at the rear of the car and work your way foward, i.e. cat-back, then new catalyst, and finally headers. If you throw a set of headers infront of a stock exhaust set-up, they will out flow the rest of the exhaust by a mile and you will only create turbulace and the $300+ you just spent on headers doesn't do too much for your car.
When it comes to selecting a cat-back system you have lots of options. Amoung the most popular are the systems from Hooker, Edelbrock and Flowmaster. All of these systems cost less than $300 (Flowmaster American Thunder systems are a little over $300). These systems are all bolt on mods that don't require welding or special tools and can be installed in your home garage in about an hour or two.
In my opinion it is a waste of money to get a high flow catalytic converter, especilly the Random Technology one that costs over $200. These high flow converters only give you 5-7 hp and in time will get clogged like your stock converter and thus hinder your performance. I would just get a Catco Converter from Summit Racing Equipment. These converters aren't a "high flow" unit but they are new and that means they are free flowing and un-clogged. A cat is somthing that should be replaced after time anyway, like an oil filter or air filter or somthing, they are simply an exhaust filter.
I hope I was of some help, feel free to email me at anytime with any questions you may have. Good luck!



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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

7.5" 10 Bolt with 3.42s soon to come!