Catless VS high flow cat
Sep 24, 2004, 12:35 PM
#18
I have both a 3" high-flow cat and a 3" test-pipe for my Eclipse. Just changing to the test pipe, DSMLink shows a 1.5lb/min increase (about 15HP) up top. The test pipe is definitely the way to go for more power, better spool-up, etc.
The only downsides are the noise, a noticeable exhaust smell, and obviously the fine if caught. I get tired of the test pipe once in a while and put the hi-flow cat back in. Much quieter and no smell. But, if you are going to run leaded gas, you cannot use a cat or it will be ruined.
Eric
The only downsides are the noise, a noticeable exhaust smell, and obviously the fine if caught. I get tired of the test pipe once in a while and put the hi-flow cat back in. Much quieter and no smell. But, if you are going to run leaded gas, you cannot use a cat or it will be ruined.
Eric
Sep 24, 2004, 12:38 PM
#19
It depends on where you live. If you're in Cali, you run the risk of getting a $2k fine for running w/o a cat. Now is this risk worth 10hp? I'd rather go w/ a high flow cat. It won't give you as much hp, but at least you'll be legal. There are plenty of other ways to get another 10hp.
Sep 24, 2004, 12:41 PM
#20
Originally Posted by Bom's Evo
if your going to mix match stuff. a UR cat delete is awesome. no CEL
...and here in Oklahoma no emissions... im lovin it.
Sep 24, 2004, 12:49 PM
#21
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Going from a UR high flow cat to a UR test pipe, it's really not THAT much louder, but it does drone a little bit on the highway. I noticed 200 rpm better spool-up (21 psi at 2750 rpm in 4th gear) and it helped pick up a few hp across the powerband.
Sep 24, 2004, 01:02 PM
#22
Originally Posted by negativeB
cat-delete in some states is illegal.
Sep 24, 2004, 04:51 PM
#25
I have a 3" catless turboback and a guy the other night with a Buschur "loud" or whatever exhaust was louder than me! I have no muffler either, just a resonator! Also, the dyno showed about a 30 ft lb gain in torque with no cat (but not as much HP). However, I think I am going to go a different route. I will put the cat back in but get an exhaust cutout for those track days. I'll splice it into the downpipe.
Sep 24, 2004, 07:04 PM
#26
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Ya I think I might keep the stock cat on with my BR turboback. I bought the test pipe but now you all have me scared I'll get caught. Anyone know what the fine is in Maryland?
Sep 24, 2004, 07:32 PM
#29
Originally Posted by lil'evil_evo
It's simple cat delete more power, but cel. High flow less power, but no cel. I went high flow but now I will be buying a cat delete soon.
Sep 25, 2004, 12:29 PM
#30
Originally Posted by marksae
Just an FYI.. the smell is very obvious when you are driving behind a car that's catless. I am sure cops will know what's going on if they're behind you.