From what I've been told its illegal or at least illegal in MD for a muffler shop to weld a high flow cat onto a vehicle. I've also read that a high flow cat will cause the check engine light to come on, since it is essentially hollowed out. Can anyone elaborate on if a high flow cat will set the check engine light off? thanks

 

There are quite a few people on here running high flow cats and aren't getting any codes. Thunder will jump into this thread very soon an tell you how it was the best exhaust mod he has ever done to his truck, I think he has a spintech cat or something like that

 

ok yeah anyone who can give me any advice on this would be awesome. I've always been told it would make the check engine come on.

 

a high flow cat is not hollowed out, it just has higher flow core on the inside. and i shouldn't cause a tripped code.

 

well midas told me know one in the state of MD will install a high flow cat. He said "now if you bring it to us already installed well then its not a problem or if you install it after, but we cant by law install it".

 

just go to an independent, or tell them its not a high flow. find some one with a welder and do it your self.

 

As he said go to a small shop they don’t care can’t you just bolt it on exhaust systems were built to be bolt on they don’t need to be welded get the clamps and do it yourself then if it comes loose later just go get it welded at that time they can’t say anything to you all you are asking for is some welding.

I could be wrong about the welding on part every state has different laws Im in AZ.

 

i've done exhausts systems before but its been like take a cat off, put a cat on. Install a muffler ect. what I was wondering though is how hard it would be to put a muffler with duals exiting pipes because I Would have to run a 2nd exhaust pipe with out hangers and that wasnt made to run on the vehicle so how would I hang it? how hard would this be?

 

well I decided to order a magnaflow hi flow cat from jegs and for about $100 it seemed like a great deal. The parts stores couldnt get anything in for a week or more, for the same part. I also got really tired of being asked "what year is it, what make and model, 4 wheeldrive or 2, what engine size". I finally said I have 2,5 in 2.5 out I want a universal hi flow. They couldnt even pull this up as fitting my vehicle until I gave them the parts number. Thats pep boys, advance auto, auto zone, car quest. What a pain in the ***

 

Oriely's had the uni cat for our trucks for like 85.00.. Summit and others wanted 100-119.. Just saying.