Upgrading Corsa with High Flow Cats?

[JKVIPER]

I am looking for your feedback on what you experienced by upgrading your Corsa Exhaust from stock cats to Random Tech High Flows.


1)Is the interior noise any louder when cruising? Any drone?

2)Does this improve/reduce the sill tempuratures?

3)Did you go with 2.5" or 3" cats?

4)Did you like the results?

 

[2001 Sapphire Blue]

1. No, No
2. Yes
3. 3"
4. Yes!! Git er done!! You'll love it!! (I actually put the Corsa and high flows on at the same time, so the difference was probably more noticeable than what you might experience)

 

[AJT]

Same answers as Sapphire, sills will be much cooler & sound a lot better.

 

[ViperGTS]

SAME HERE: Drone went away with Corsa and HF-3".
Inside not loud - outside at WOT is VERY-VERY loud

 

[Bratatatat]

Same answer as Sapphire ... I also installed Belanger headers at the same time. Love it.

 

[KenH]

The HF cats do up the sound volume quite a bit. Somewhat louder at idle and significantly louder at WOT. I don't think it reintroduced any significant drone and the side sills are much cooler. It also tended to make my Corsa exhaust sound raspier, which is good or bad depending on what sound you are looking for. Less burble and more bark. I added headers as a 3rd step and they had much less affect on the sound than the HFs did.

The only reason not to do them is if the exhaust is already on the loud side for you. Since your Corsa is 3", there is no reason not to go with the 3" HFs as well and if you eventually go with headers, you'll want to have the 3" cats

 

[GTS Bruce]

If you are not sniffed then why not just skip the cats.Louder,No drone,Cool side sills,Need syms. GTS Bruce

 

[JKVIPER]

Do I need sims if I put the High Flows on?

 

[ViperGTS]

I had no sims with the HF cats.

 

[KenH]

Do I need sims if I put the High Flows on?

No, you would need them only if you go catless.

 

[Bad Car]

I replaced my exhaust with Corsa and Random Tech High Flow cats.

Great Sound and my Sills temps are much cooler.

 

[ViperJoe]

Had the Corsa and RT hi-flows on the 98 and just got the same package from PartsRack for the 02. No drone at all. sounds ok at idle, normal driving won't piss off the neighborhood, and WOT is........ YEAH BABY......all hell breaks loose!

I got the 3" which I believe is all that Corsa makes now and 3" RT hi-flows with the 3" to 2-1/2" adaptor for the stock header pipe.

 

[Hoosier Daddy]

1. No, No
2. Yes
3. 3"
4. Yes!! Git er done!! You'll love it!! (I actually put the Corsa and high flows on at the same time, so the difference was probably more noticeable than what you might experience)

Ditto

 

[wesman]

What are the answers if you go with str8 pipes instead of hi-flows ? I have cat delete pipes and am contemplating whether I should install them at the same time as the headers/exhaust or go with hi-flows instead.

I also saw mention of sims when suing str8 pipes. Where can one get the sims from?

--wes

 

[ViperJoe]

No cats = awful smell, louder, and flames out the exhaust!

Do you live in an State that sniffs?

Any of the supporting vendors sell O2 simulators. PartsRack, Roe, etc

 

[GTS Bruce]

LOUD?FLAMES?SMELL?Yes!Yess!!U R driving too slow. GTS Bruce

 

[wesman]

Is it unbearable loud? or just a bit louder ? any resonance? My state doesn't require a sniffer unless it's an OBD-1 car, so pre-96. As long as it doesn't trip a code (shouldn't as long as I have the sims ).

--wes