Any negatives to having a 3" catback?

[ssmith891]

After searching through here, reading opinions, and many videos, I decided on the Corsa Xtreme catback for my exhaust setup! I know this setup only comes in a 3" option, so my question is, are there any negatives to putting this on if I don't plan on going F/I (loss of HP/TQ, back pressure issues, ECU pulling timing to protect cats, etc.)?

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[2015 Silver GT]

ECU pulling timing to protect cats, etc.)?

:headbonk:

 

[Ruby red GT]

I haven't experienced any negatives and have been running the cat back for a year now.

 

[ssmith891]

Originally Posted by ssmith891
ECU pulling timing to protect cats, etc.)?

:headbonk:

Swear I read that on another forum but maybe not...

EDIT: Actually, just found it:

http://tiny.cc/3a8cay

 

[Lost]

Actually, as exhaust gasses cool, having a too big exhaust diameter can slow velocities and attenuate scavenging. I have no idea what the ideal diameter is, but have read about this before.

 

[Rhinogt]

When the car goes into Cat over temp protection, it doesn't pull timing. It dumps in more fuel. You'll be hard pressed to find conclusive data that a cat back will cause this.

 

[1BadAss16CS]

are there any negatives to putting this on if I don't plan on going F/I

No.

2.5" vs. 3" cat-back exhaust = tone change only.

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