High Flow cat, Is this the right one? Illegal?
 

http://cgi.ebay.com/ebaymotors/ws/eB...category=33629


Is this the right part for the Bonneville?Horse Power gain? Probably 5 HP?

Is it illegal to replace your cat if its still functioning?

Thats the one I've got, though it won't yield a 5HP gain. It is perfectly legal as well. Here the rules are you must have a cat on your car if it came with one, and thats pretty much it.

I don't know if you need the air tube version or not.

But otherwise, I believe they come with CARB certification.

No he won't need the air tube. He doesn't have a smog pump. ;)

Not even a 5 horse power gain?

Why do people go for high flow cats? Just a replacement?

Depends on the car. Maybe the L67's might gain that. There IS a gain. Probably 2-5 hp depending on mods.

Probably would be like 2HP for me. I will take what i can get though...hehe. Does yours smell like rotten eggs? Mine does, and I am waiting for it to kick the can.

A high flow cat works in conjunction with other mods, the more you have the likely hood that you will develop more power.

So if I plan on adding things like,headers, rockers,cam,nos and a Super Charger a high flow cat would be worth it?

Yes. Gotta remember our engines don't move all that much air [compared to some others], so gains like that aren't as noticable.

If your original was shot, you will gain a few ponies.. but if it was in good working order, then you probably won't feel a thing. <--notice how I didn't say won't gain a thing.. just that you won't feel it.


-justin