G70 BMS 450HP kit.. Catless Downpipes or High Flow Cats?

[Tombugg]

So Installed the BMS 450HP kit now deciding between the ***-less down pipes or High flow cats.. I live in FL so don't have to worry about smog. Was curious about what HP gains I could expect with either set up and if I do go ***-less will I need to do anything with the tune to not throw CEL?
Cons / Benefits of each for anyone that has done it?

Sorry if this is already posted, I googled, checked the JB4 forum and looked through here. If it is apologies, can someone point me to it?

As always, thanks in advance!
Tom

 

[Glasman888]

Go catless. Since you're in Florida, you don't need the high-flow cats.
You'll get a bit more power and sound without them. The high-flow cats are really just for emissions legality.
Yes, you will get a check engine light with catless downpipes. Your JB4 can likely clear the code for you, or you'll need a separate O2 sensor spacer to prevent it.

 

[Sciottiesco]

So Installed the BMS 450HP kit now deciding between the ***-less down pipes or High flow cats.. I live in FL so don't have to worry about smog. Was curious about what HP gains I could expect with either set up and if I do go ***-less will I need to do anything with the tune to not throw CEL?
Cons / Benefits of each for anyone that has done it?

Sorry if this is already posted, I googled, checked the JB4 forum and looked through here. If it is apologies, can someone point me to it?

As always, thanks in advance!
Tom

You will need a BEF to run catless primaries. You can run catless secondaries though.