Well, I had the car dynoed a few years ago with the only mod being an Slp lid. The numbers were 323rwhp and 338rwtq. Last week I had the car dynoed again on a dynojet (same as the first time) and picked up an average of 6 rwhp and 6 rwtq from adding the Corsa. I knew the ws6 catback was better than the standard ta's and z28's so I wasn't expecting 10-12rwhp like you may get on a base car Corsa swap. So here's the graph.

 

If nothing else, you can see your car is still running very strong compared to a few years ago and probably sounds killer. I was gonna say "get longtubes" till I saw where you lived.

 

Nice #'s for basic stuff. You can always be a rebel and say screw smog like me and go with some LT's

 

You dont have a tune?? The A/F is pretty dead on and most Ive see with a new lid the car goes lean. Mine certainly did.

 

The car's never been tuned, but I've had the Corsa on for over 2 yrs. No worry about smog-nazies here. The car's plated and titled in my home state. The thing I do care about is the car being too loud with a set of long tubes. I talked to the owner at CMS and he said even with cats that the Corsa's pretty loud. I've heard all the clips on this site of corsa and lt's but it's not quite the same as hearing a car in person. I may do a mid-size cam and heads for a stealth setup, I'll see. Thanks for the feedback.

 

Yea, the corsa is DAMN loud with anything.

 

I have corsa on my car and they are quiet at idle and while cruiseing but they get damn loud at WOT. Plus they sound amazing to. But I have longtubes and a catless x-pipe so I can't say how they will be on your car.