I talked to a GM tech today and he said that not having a muffler kills your low end. So I told him that since the exhaust can flow easier I will still gain a smidgeon of top end hp. He pretty much called me a bullshitter.

 

So what about people with cutouts and stuff?

 

Dealership techs aren't authorities on performance modification <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

He's referring to back-pressure- or lack thereof <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

With stock manifolds/cats etc. it's not a worry to consider.

Atap and MAFT fixes up aaaaaaany problem with bolt-ons . . . or take-offs <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

 

It's true most of us racers run as much muffler as possible because free flowing exhaust really chokes power off. Oh and don't run NOS it will blow your engine.

 

Hehe.. I run 1" 7/8 Headers, 2" 7/8 OR Y pipe to a open cut-out at the track. Torque is never a problem <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">It's true most of us racers run as much muffler as possible because free flowing exhaust really chokes power off. </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That's what I was thinking too! I'm planning on running two Flowmasters inline with a 2" I-pipe to boost my torque output.

I wonder when those Fuel guys will figure it out and cap off those headers with little mufflers for more torque...

<img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

 

There is a 1 psi difference in backpressure with no muffler. I tested it. It went from 5 to 4. Those numbers might be off by a tenth but you get the picture. You have PLENTY of backpressure to spare!!!! <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

ERic

 

You da man,Wizkid. Preach on. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

 

What about "with an ORP you will lose low end TQ" Is that just a rumor the smog police started so you don't remove your cats?

 

LOL......

Do not take your peformance advice from a GM tech. Some of them are excellent when it comes to REPAIRING cars, but you will find that most GM techs are lost when it comes to modifying unless they have been working on cars as a hobby for several years...

I have a few guys working in my shop that are some of the best damn mechanics I have ever seen. Probably nothing out there they couldn't fix but they wouldn't know the first thing about making an LS1 faster.

Josh

 

You need an O pipe for maximum POWER!!!!!!!!

Justin

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Jsears8:
<strong>You need an O pipe for maximum POWER!!!!!!!!

Justin</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">LMAO!!! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> but you have to buy the muffler bearings to make the O-pipe work at its full potential! <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

 

Do you want summer air or winter air in those tires? LOL

90% of the time don't believe anything anyone at a GM dealership tells you.

WIZKID, was that test with or without cats?

 

Tell that tech <img border="0" alt="[judgement]" title="" src="graemlins/gr_judge.gif" /> he is a dumb a$$!
<img border="0" alt="[hail]" title="" src="graemlins/gr_hail.gif" /> <img border="0" alt="[Pontiac]" title="" src="graemlins/formula.gif" />

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Jsears8:
<strong>You need an O pipe for maximum POWER!!!!!!!!

Justin</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">The O pipe works best when combined with carbon fiber headers and pushrods... you also need 3 type "R" stickers per side for full effect. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Speed Demon:
<strong>Do you want summer air or winter air in those tires? LOL

90% of the time don't believe anything anyone at a GM dealership tells you.

WIZKID, was that test with or without cats?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I would like to know this as well..