ExtremeZ28

I know this may sound like a stupid question but as far as power goes is this true or what?? Would there be a better plate to use to get better power or is Wide Open the way to go??
Thanks
Jay

Jon

I dunno, but it seems to me that a Boral ran wide open would give the same effects as a cut out, but I duno. <img src="images/icons/confused.gif" border="0">

JaSSon00

yeah, it is similar, though ive heard people who took the right side tip/pipe off gained horse power, which would mean that a cutout (even closer to the headers, would pick up a few more?????)..sounds quite a bit different when the tip is on versus off....

DenzSS

You're splitting hairs at that point. No reason to do it unless you just like the sound.

Bluestreak

A buddy of mine picked up 17 at the wheels with a cutout... I have not heard of a Borla having such success (especially for what they cost) though I'm sure there are just as many of those as there are of folks who've had success with the cutout. Personally, I'd opt for the cutout, mine was a grand total of $46 shipped and installed. What does a Borla cost? <img src="images/icons/wink.gif" border="0">

DenzSS

I'm not arguing with that. I have a Borla and quite frankly they're not much bang for the buck. A 17RWHP gain is not going to be found on a bolt on car by installing a cut-out. What is the rest of this story? Heads/cam/FI? There just isn't that much HP to be found with a cutout unless that was one serious bottleneck with that guys setup.

Bluestreak

[quote]Originally posted by DenzSS:
<strong>A 17RWHP gain is not going to be found on a bolt on car by installing a cut-out. What is the rest of this story?</strong><hr></blockquote>

I watched it myself. He did the same thing I did - a ported MAF housing and a cutout (we bought the twin pack). He had the SLP air temp module, but took that off. His dyno went from 305-rwhp to 322-rwhp. That's all that was done... nothing fancier...

DenzSS

A ported MAF is worth several RWHP itself.

I've seen anywhere from 3-7RWHP from MAF ends. That puts the cutout in the normal range to be gained from exhaust. Still a good gain and the best bang for the buck. No argument.

I knew something else was in the mix though. On a relatively stock car, nobody will see 17RWHP from a cut-out alone.

SweetSavannah

I run my Borla wide open - no plates - virtually all the time. My guess would be cutouts would give a marginal increase in HP, not enough to matter.

I can't see why any plate would give less restriction than none. However, even with no plate in, and measured by putting my hand in front of the left and right side exhausts at idle, I'd estimate that 2/3 to 3/4 of the exhaust flows out of the unrestricted right side and about 1/4 to 1/3 on the muffled left side. Don't know if this proportion changes as more exhaust is dispatched under WOT since my hand won't stretch that far back from the driver's seat and I can't get anyone to ride on the back bumper as we crest 100 mph at WOT.

One aside: who cares how much HP is gained? Seems to me what we want to know from the dyno is how much TRQ is picked up across the rpm band.

mitchntx

iTrader: (14)

Comparing Dyno runs can be misleading.

I've seen back to back dyno runs without any changes vary 5hp. That's almost 1/3 of the claimed 17 picked up with just a cutout.

Many factors can be attributed ...

So, dyno racing is not real world and conclusive evidence of gains or losses. They are great tools, don't get me wrong. But be careful about basing gains on dyno numbers.

Bluestreak

I should've made that distinction... forgot we also did that...

ExtremeZ28

so what would be better for the track which plate??? mods in sig??

WICKED SS

iTrader: (36)

What about SLP's loudmouth? Its pretty much like have either one of those right? If so I wonder why I didnt really feel like I gained any power with the loud mouth???

8URTANG

Bluestreak, where did your friend mount his cut out ? Mine will be here tommorrow, and I can't wait to get installed. I'm gonna uncap it and come home at 3am to bother my annoying neighbors <img src="images/icons/grin.gif" border="0"> being young and abnoxious rocks <img src="images/icons/grin.gif" border="0">