Exhaust Systems....Researched - Page 3

mrnickleye · 10-26-2005, 03:06 AM

Well...I manage a smog test & repair shop here in CA. The high flow cat, like Magnflows (the brand of cats we use) will get you thru smog at least once. The specs are higher on our MKIIIs than newer cars. The high flow cats are just that, and many times the openess does not allow the cat to get hot enough to do its job.

I installed the 2 1/2" cat and piping all the way back. It seems to work fine. I am only 225 hp, though. My smog #s are very good.

Be sure to get a new O2 every few years. Cheap insurance for better fuel mixture ratio.

mrnickleye · 10-26-2005, 03:19 AM

As for cold air intake, I've read lots on the net, magazines, and forums. With the AFM like our n/a has, you'll end up putting a K&N (or similar) either directly onto the AFM (mine), or on the 3" pipe you'll use to run out front somewhere (behind the headlight?).

I ducted air with galvanized sheet metal up from the front grill to the opening for original airbox, behind headlight.

Then I made a plastic box to seal off the heat from under the hood from getting into the K&N.

You DO NOT want hot air going into the air cleaner, it cause HP loss !!!

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10-26-2005, 03:06 AM	#1
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	Well...I manage a smog test & repair shop here in CA. The high flow cat, like Magnflows (the brand of cats we use) will get you thru smog at least once. The specs are higher on our MKIIIs than newer cars. The high flow cats are just that, and many times the openess does not allow the cat to get hot enough to do its job. I installed the 2 1/2" cat and piping all the way back. It seems to work fine. I am only 225 hp, though. My smog #s are very good. Be sure to get a new O2 every few years. Cheap insurance for better fuel mixture ratio.

10-26-2005, 03:19 AM	#2
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	As for cold air intake, I've read lots on the net, magazines, and forums. With the AFM like our n/a has, you'll end up putting a K&N (or similar) either directly onto the AFM (mine), or on the 3" pipe you'll use to run out front somewhere (behind the headlight?). I ducted air with galvanized sheet metal up from the front grill to the opening for original airbox, behind headlight. Then I made a plastic box to seal off the heat from under the hood from getting into the K&N. You DO NOT want hot air going into the air cleaner, it cause HP loss !!!