please explain the difference....help

fluffyrunnells · Oct 17, 2006

i understand the difference when you go from stock mid pipe to a off road x....rwhp gain, and loud. now what if you go with an x pipe with high flow cats..?? tiny hp gain..??? and louder....??

i think i have asked before but never really got an answer...

any help

Kilgore Trout · Oct 17, 2006

When you lower back pressure you move the powerband up in the RPM range.

fluffyrunnells · Oct 17, 2006

got that part...

just weird question, not looking for anyone to tell me to buy or not to buy. just i know the difference from stock to o/r, have experienced it first hand. just looking to see if the x or h with high flows is in the middle, not even close or not far...........

TrueBlue03 · Oct 17, 2006

i just switched from a MAC offroad H to an SLP catted X ...much quieter (especially because of the packs) but the car actually feels a tiny bit faster with some back pressure

the SLP Catted X is noticeably louder than the stock H also.

and now i'm finally able to smash the pedal to the floor and have it not sound like a drive by shooting.

merc123 · Oct 17, 2006

The difference:

No Cats = Less backpressure, louder, more HP/Less torque

With Cats = More backpressure, quiter, less HP/more torque

ShapeShifter · Oct 17, 2006

TrueBlue03 said:
i just switched from a MAC offroad H to an SLP catted X ...much quieter (especially because of the packs) but the car actually feels a tiny bit faster with some back pressure

the SLP Catted X is noticeably louder than the stock H also.

and now i'm finally able to smash the pedal to the floor and have it not sound like a drive by shooting.

LOL,thats what mine use to sound when i had an O/R H and SLP LoudMouths!!
"hit the deck",bwhahaha!!!

BurningRubber · Oct 17, 2006

I went from stock H with no mufflers to UPR o/r X with stock mufflers.

Stock, grunt down low, didnt open up a can of whoop ass up top or anything, but felt good.

UPR o/r X and stock mufflers. Still allright down low for a 4.6, little less... but get up in the RPM's and it opens right up, it feels like it pulls a bit more than the stock h and no mufflers.

ADRENLN · Oct 18, 2006

no cats will make maybe 2 over the high flow catted pipe.

i also use the slp catted x pipe and like it better then the bassani o/r x i used to have.

CobraRed_96_GT · Oct 18, 2006

SLP catted is what i have, preffer it over most; hangs a bit low tho

jegg · Oct 18, 2006

TrueBlue03 said:
i just switched from a MAC offroad H to an SLP catted X ...much quieter (especially because of the packs) but the car actually feels a tiny bit faster with some back pressure

the SLP Catted X is noticeably louder than the stock H also.

and now i'm finally able to smash the pedal to the floor and have it not sound like a drive by shooting.

Have you had to smog test your car yet with the catted SLP x pipe? I am wondering because i am considering buying one but was scared that i would not pass smog even if it was catted.

04GTMustang · Oct 18, 2006

i passsed emissions with mine last weekend but i dont know if they did a sniffer test on it or not but i passed thats all that matters.

streethorse · Oct 18, 2006

fluffyrunnells said:
i understand the difference when you go from stock mid pipe to a off road x....rwhp gain, and loud. now what if you go with an x pipe with high flow cats..?? tiny hp gain..??? and louder....??

i think i have asked before but never really got an answer...

any help

Even another scenario that I considered ( not to hijack ) but what about an
x pipe with the stock cats still in place. anyone try that........

bakos24 · Oct 18, 2006

TrueBlue03 said:
i just switched from a MAC offroad H to an SLP catted X ...much quieter (especially because of the packs) but the car actually feels a tiny bit faster with some back pressure

the SLP Catted X is noticeably louder than the stock H also.

and now i'm finally able to smash the pedal to the floor and have it not sound like a drive by shooting.

So by replacing your o/r to a catted stopped the machine gun sound? I think I will have to do that. Mine sounds like that with my LMIIs and UPR X when I stomp on it, other than that sounds great.

TrueBlue03 · Oct 18, 2006

yep as soon as you throw some cats on there, the machine gun/backfiring blasts stop and all you hear is the tone

but i miss having the loudest stang on the road

TrueBlue03 · Oct 18, 2006

streethorse said:
Even another scenario that I considered ( not to hijack ) but what about an
x pipe with the stock cats still in place. anyone try that........

nah i wouldnt do that. that would just be too much work and probably end up costing you just as much as buying an aftermarket catted x....and still having the crappy stock cats cloggin up the exhaust flow.

please explain the difference....help

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