Not trying to be that one goody two shoe guy that always points out illegal things, but you are right hometheaterman, no cat is illegal in every state because its a Federal law. Some states have their own penalties as well, but its definitely a Federal violation and Federal file.

That being said, they have to catch you first.

 

hometheatre did u notice a seat of the pants feel when u put the magnaflow hi flow cat on?

 

Sure he did, his wallet didn't have as big a bulge in it....

 

Haha I did the front o2 sensor and cat. I did the cat then drove 30 miles or so then the sensor. It might have helped slightly but if it did it was very slightly. It did change the sound a little but I didn't notice much of a power difference. If any it was very slight. I do however like the cat and think that if you have a glogged cat or want it a tad louder it's the way to go.

 

what about a resonator?...isnt that pretty much like a big hollowed out glasspack....i know a guy that has a mustang with a SLP system and it is a lot louder than my truck.....im pretty sure SLPs are just resonators and pipes/tips.....thanks for all the input guys

 

I made a true dual system for a friend on a 99 5.2 that ditched the cat converter and ran true dual 2.5 inch pipes from the manifolds back to 9 inch long glasspacks that then exited out the back through 4inch x 24inch tips. That sumbitch woke up the dead. I made my true dual system on my 95 5.9 out of 2.25 pipes from the motor back to 40 series flowmasters. That is louder than when I had the same setup that you had. Made mine for $150 and the glasspack one for little less than $100.

 

up the exhaust tubing to a 2.5 and put a flowmaster 40. not a delta, or a super, just go straight 40 series. it sounds a hell of a lot better than glass packs or straight pipe in my opinion. for tips go with an 18 inch and go 3 inch or larger in diameter. bigger tips give better sound. i had a 91 camaro, 305, no cat, all 3 inch pipe before muffler, 2.5 outlet pipe with dual 18 inch long 3.5 inch diameter tips and it made the 305 sound amazing, even for being one of GM's worst motors.

 

you will get better gas mileage if you dont dump it all as well, you have to have that little bit of backpressure, and by dumping your cat and your muffler you lose power as well as gas mileage. I would have to agree with gobigorgohome on the 40 series, its a good sound, then invest in a high flow cat and some headers and you should get some mean sound.