High flow cat; How much of a gain?

[eclipse13]

I currently have an ssautochrome header and downpipe, and a 2.5" exhaust catback. How much of a difference would a highflow cat do. Is it worth the money? I also have an intake and UDP if that helps at all.

 

[dj_zero]

I can't comment on a 2.5" system, but I just had a high-flow cat welded onto my stock system today. It made a difference, definitely. Not a huge difference, but noticeable. It sounds better, too. My exhaust tone got a little deeper after the bigger flex pipe, and now it's even deeper still. It's a great sound. I did mine for emissions purposes, though, not performance. It was 30 bucks off ebay from a company called Eastern Catalytic.

 

[GSGoinFast]

I can't comment on a 2.5" system, but I just had a high-flow cat welded onto my stock system today. It made a difference, definitely. Not a huge difference, but noticeable. It sounds better, too. My exhaust tone got a little deeper after the bigger flex pipe, and now it's even deeper still. It's a great sound. I did mine for emissions purposes, though, not performance. It was 30 bucks off ebay from a company called Eastern Catalytic.

is that a real hi flow cat or an "ebay special" "cat"? a hi flow, 2hp-5hp max

 

[eclipse13]

how about an ebay special.

 

[dj_zero]

No no, it's a real cat, I made sure of that. It's supposed to be good for any vechicle up to 4,000 pounds/4.0 liters. Like I said I needed mine for emissions.

 

[eclipse13]

But how much of a gain would a testpipe/ebay special give? Would it be worth it to get to complete my exhaust?

 

[GSGoinFast]

But how much of a gain would a testpipe/ebay special give? Would it be worth it to get to complete my exhaust?

5hp max

 

[eclipse13]

would it be worth it for $40?

 

[Ballin' GS]

You'll see a couple hp probably, and less torque. You will feel the torque loss, i did for sure. Also it will make your exhaust note a tad higher and raspier. Overall, not really worth it, but 40 bucks is not a whole lot.

 

[dj_zero]

Your exhaust note went higher? Mine got lower, I think it sounds really good now. I agree, though, you'll definitely feel the loss of torque. No big deal, just change the rpm where you usually shift at.