Off road pipes needed for pulley swap on Super Stock/Redeye/Demon?

[BoostedGTA]

Wanting to do an upper and lower pulley on my 2021 Super Stock, which is currently on an E85 tune with ID1300's... leaning toward a 2.85 upper and 10% lower. From what I've gathered, this will require off road mid pipes, correct?

 

[Hatermkr]

Wanting to do an upper and lower pulley on my 2021 Super Stock, which is currently on an E85 tune with ID1300's... leaning toward a 2.85 upper and 10% lower. From what I've gathered, this will require off road mid pipes, correct?

No it will not

 

[DavidKFla]

No it will not

^^^^^^^
He knows.

 

[BoostedGTA]

No it will not

So no issues with the cats at the higher boost level? If so, that's great since I didn't want to give them up anyway.

 

[vortecd]

Cat deletes sound pretty good with stock cat back. It's a little louder but not crazy. On e85 the smell if fine but can be pretty bad on 93, worse the colder it is outside

But also, my 9.1 was with full stock exhaust as was Jon's 8.8

 

[16GoManGoHC2]

1075 wheel through stock cats, but I think this is about the limit with cats as boost is higher then it should be and I’m thinking between cam and cats is the reason.

 

[BoostedGTA]

Cat deletes sound pretty good with stock cat back. It's a little louder but not crazy. On e85 the smell if fine but can be pretty bad on 93, worse the colder it is outside

But also, my 9.1 was with full stock exhaust as was Jon's 8.8

I was hoping being on E85 would eliminate some of the smell that I remember from previous cars being catless. If I decide to do off road mid pipes, they seem to be hard to come by now.

 

[vortecd]

I was hoping being on E85 would eliminate some of the smell that I remember from previous cars being catless. If I decide to do off road mid pipes, they seem to be hard to come by now.

I like the smell of e85 but wouldn't say it is that noticeable unless in a garage. You can make plenty of power and stock exhaust. May guess the 170 isn't any different then a hellcat exhaust

 

[fubar569]

I've "deleted" them on every build since my CTS-V started to melt the stockers on a basic 2.5 combo.

Can't melt what's not there.

Also. Because F%$K the EPA.

 

[vortecd]

I've "deleted" them on every build since my CTS-V started to melt the stockers on a basic 2.5 combo.

Can't melt what's not there.

Also. Because F%$K the EPA.

I get that but sounds like a tuner issue. For everyone that has not had that issue tells me it can be done. I thought there was an issue years ago when someone told me his cats melted. Car never ran right and it was a tuner issue

 

[fubar569]

I get that but sounds like a tuner issue. For everyone that has not had that issue tells me it can be done. I thought there was an issue years ago when someone told me his cats melted. Car never ran right and it was a tuner issue

The CTS-V2 cat issue was not a tuner issue. I can promise you that. That's GM being typical GM. Lowest possible bidder. Like the military.

Now on this platform? Sure. Run the factory cats if you want. You're probably fine. I wasn't gonna risk it again though.

 

[BoostedGTA]

Thanks for the input guys! Hope to step up my game in the next few weeks!

 

[2ndAmend]

If anyone had recommendations on cat deletes (mfr, p/n) I sure would like to hear them. Thanks.

 

[BoostedGTA]

If anyone had recommendations on cat deletes (mfr, p/n) I sure would like to hear them. Thanks.

Barth recommended Cornerstone Performance Solutions CPS-MPK-6264-CC I believe... Don't think you'll find them any cheaper, if you find any at all.

 

[2ndAmend]

Barth recommended Cornerstone Performance Solutions CPS-MPK-6264-CC I believe... Don't think you'll find them any cheaper, if you find any at all.

Thank you, sorry if I sidetracked your thread. Just what I was looking for!

 

[Jon-MooredPerformanceLLC]

As everyone as said not needed.

Feel free to reach out if you have any questions on your setup.

 

[Jon-MooredPerformanceLLC]

Not sure your goals but a super stock with that pulley combo is no joke as far as power. It’ll easily be a low 9 second car with a chance of 8s depending on your elevation.

 

[BoostedGTA]

Thank you, sorry if I sidetracked your thread. Just what I was looking for!

no problem at all! I had been looking all over for them and had the info handy.

 

[BoostedGTA]

Not sure your goals but a super stock with that pulley combo is no joke as far as power. It’ll easily be a low 9 second car with a chance of 8s depending on your elevation.

That's exactly my goal, capable of 8.99 in decent conditions...

With that being said, how much am I leaving on the table for running stock catted mid pipe with upper/lower pulley combo instead of going with catless mids?

 

[fubar569]

Maybe 1 psi lower boost and 20hp?

For the hassle. Not entirely worth it when you're capable of doing so as it sits.

Now. Sound-wise...you're leaving a lot on the table. I did a back to back to back of factory vs catless only vs catback only and catless won by a mile.