Hi-Flo Resonator performance ?? - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 09-19-2004, 03:44 PM   #21
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Differing opinions on that. Maybe 5hp by itself. 10 if you match a good muffler to it? There are those that claim 10hp with a cat delete, but I think that may only hold true with MAJOR mods. You can get close with the right performance cat, so for that reason, it'* worth keeping.

I don't want to get caught without one, and I'd like my exhaust to be worked on by a pro, which wouldn't be possible if I had deleted the cat.
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Old 09-19-2004, 10:00 PM   #22
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That makes sense.but I have TOG Headers, Borla Cat back Exhaust...and Stock CAT.....HighFlow CAt iin this setup..maybe 5-10hp eh?
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Old 09-20-2004, 12:18 AM   #23
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Quote:
Originally Posted by blackssei
That makes sense.but I have TOG Headers, Borla Cat back Exhaust...and Stock CAT.....HighFlow CAt iin this setup..maybe 5-10hp eh?
If your cat is clogged it may gain you BACK that lost hp, but it probably wont increase your hp especially with togs and ct-back.
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Old 09-20-2004, 12:21 AM   #24
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I'll go with that. The routing and components in the 2000+ SSEi'* just LOOKS less restrictive. I know alot of guys are running in the 13'* with stock exhaust.

I think GM paid alot more attention to the exhaust post-99.

The difference between a stock cat and a performance unit is less than 10% when measuring CFM'*.
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Old 09-20-2004, 12:29 AM   #25
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If I remember right all the bonnies in the 13'* currently have stock exhausts (at least from the cat back). I could be wrong though...
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Old 09-20-2004, 10:37 PM   #26
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Hey, my redneck exhaust guy suggested putting some adapters and a 3" cat in. Good idea?
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Old 09-20-2004, 10:38 PM   #27
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L27? Completely unnecessary. Hi-flow 2.5", and you won't be able to outflow it.
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Old 09-20-2004, 11:01 PM   #28
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I can't figure out how you meant that yet.... So I'll just take it as advice with no underlying L27 hating going on... Thanks
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Old 09-20-2004, 11:05 PM   #29
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Simply put, if an L67 can't outflow one, you'll be ok with the 2.5", as long as it'* a performance unit

The extra price of a 3" with adapters probably wouldn't be worth it for the returns in performance.
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Old 09-21-2004, 10:02 PM   #30
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This is exactly what my Cherry Bomb glasspack looks like inside..."perforated"...and the reason I chose it to preceed my MagnaFlow stainless muffler. Cool.
Now that I know what the MagnaFlow looks like, if I need to replace the Cherry Bomb, I've got a confirmed visual that it is virtually identical, except the body is stainless steel. Excellent. :P
Thanks, Will.
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