mezzerTL-S

thanks phipark, btw guys I still haven't had a chance to get that installed yet, my three sons keep me hopping so hopefully I can find a couple of hours this weekend

Phesto

2003 Tl-s

snowman81

I always thought that we had a high flow cat on there to begin with. I know this was talked about quite a while back and most people seemed to agree that the cat on there was not really worth replacing for hp/torque gains. I'll see if I can find the thread on it but it was a long time ago.

subtledreamer

Keep us updated please

mezzerTL-S

personally for myself I didn't buy it for Hp or torque gains, I bought it to have a full stainless exhaust from the engine to the muffler tips

Phesto

^^^^ me too,I wanted to be able to look down there and see a whole new exhaust set up .......You should at least remove that heat shield then,if u dont want a high flow cat........ I also think my car has a deeper tone.

snowman81

Yeah, I can definitely see that...and I would probably do the same since I have Comptech all the way except for the cat. I'm just not sure if there are really any gains to be had here.

snowman81

What does removing the heat shield do? I would love to hear a little deeper tone. The Comptech exhaust is still a little to high pitched for me, I ended up putting the silencers in.

Phesto

some people have had rattles or resonace caused by the heat shield having a loose bolt/screw.....its really piece of mind i guess no one really ever looks under you car

mezzerTL-S

okay, so the cat is on and functioning fine , sorry that I didn't take any pictures as I didn't do the install, however what I can tell you is this... the hi flow cat is about 1/2" shorter than the stock cat (no biggie), the O2 sensor bung is in a different location so extending the wire about 6" is necessary and no CEL (again no biggie), as far as exhaust note I can notice a slightly deeper tone (me like), as far as any gains I doubt it but wasn't expecting any anyway... so far I'm satisfied and will post if there are any problems

TLsu

Are you going to do a dyno to compare to a dyno of your car just before the RT cat? We all know butt dynos are inaccurate. Thanks for sharing!

phipark

How do you go about extending the wire harness? So I assume you were able to pull the b-pipe 1/2" towards the cat with no problem?

mezzerTL-S

TLsu, I didn't do a before dyno so I probably won't do a dyno now... any gains (if any at all) are barely noticeable, but like I said the exhaust note has definately changed.

phipark, when the cat was off the the o2 sensor has wire (actually 4 wires)that are about 12" long and goes to a plug, so after unplugging I had some wire (20 gauge)and cut, extended and sealed them to prevent any moisture from getting in... as far as the b-pipe is concearned yes once the nuts are loosely fastened and start to tighten everything pulls together... I 'll be checking the tightness of the connection frequently for the time being to make sure that they stay tight

dj5

mezzerTL-S thanks for testing this mod out. I was interested in another bolt on mod and this one had my interest. Based on your review sounds like I will pass on this one. I really don't want to cut my O2 wiring harness to extend.

phipark

x2

MrAlex

samething here..