Hey all,

I am planning on putting a test pipe, or high flow cat. But, I have heared that this causes a loss in power. Is this true, and should I do this mod to my '99 LS?

 

i advise you to convert to obd1 before doing a test pipe.

 

dont listen to him i gutted my cat and i am obdII no problems no CEL's

 

IMO a test pipe sounds like crap. Just get a high flow cat and an o2 simulator. But make sure the rest of your exhaust is up to par.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sack Master &raquo;</TD></TR><TR><TD CLASS="quote">IMO a test pipe sounds like crap. Just get a high flow cat and an o2 simulator. But make sure the rest of your exhaust is up to par.</TD></TR></TABLE>if he's going to get a cat, he should get one that has an o2 bung so he wouldnt need the o2 simulator. i definitely agree though, test pipes add a degree of 'raspiness' sound to an exhaust. a good high flow cat (like carsound) will only rob the car of a few hp if any, the amount is neglible.

 

you will loose a little low end tq but i doubt youll notice loosing any tq and youll gain some top end. if you use a peice of thin pipe then it will be raspy but a slightly thicker pipe will sound better.

 

If everything else about your exhaust system is stock, don't get a test pipe. In honesty, it will sound like ****. You probably wont benefit from any power gains since (if) you have the stock straw piping.

Think about it this way... if you're planning to stay all motor, then the highest I would go is 2.75" piping (custom mandrel bends) exhaust system from the header back including a high flow cat or test pipe. Else, if you are going the FI route and plan to make more than 300whp, then a 3" will suffice.

What are your plans anyhow?

 

Thanks for opinions. As of right now I plan to go all motor.