Anyone straight pipe one with a CAT?

[Matt400]

I would like to increase the exhaust CFM capabilities for 300/350hp up from my puny 235 but don't want the feds breathing down my back or the dealer having a cow if shes in for warranty stuff.



Wanting my cake too I don't want to increase the cruise or towing noise level in the cab but more noise on brisk unloaded acceleration would be acceptable.



I think pulling the muffler and leaving the CAT would be too loud, not sure.

I have heard Nelson and Donaldson make quiet ones with more flow but most of the posts talk about systems without CAT's



Any ideas that will keep the CAT?

 

[Extreme1]

Gut the cat. It will pass an inspection and won't plug up like most do. My early '94 built in December of '94 never had a cat.

 

[Matt400]

Originally posted by Extreme1

Gut the cat. It will pass an inspection and won't plug up like most do. My early '94 built in December of '94 never had a cat.

Thats an idea too but I would definitely want a muffler then cuz I like it quiet.

Maybe a good muffler with gutted CAT would be the Nelson 86514 that has a 4" inlet and 5" outlet. Flow & db rating on that muffler look pretty good also.



I would just have to find a 5" tail pipe for it.