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Old 08-31-2016, 08:22 PM   #1
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straight pipe bad for the car?

in my experience, straight pipe is bad for the engine since there's no back pressure... is that the case for the 5.0? i have a 2014, slp loud mouth, x pipe, and cat deletes. still have the resonators. also sometimes at idle i smell gas, new to the off road pipe so not sure if its the lack of cats that cause the smell. just not trying to burn up my valves...
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Old 08-31-2016, 08:30 PM   #2
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The need for Back Pressure in a 4 stroke motor is a complete Myth Dude!..


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Old 08-31-2016, 08:40 PM   #3
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The need for Back Pressure in a 4 stroke motor is a complete Myth Dude!..


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I hope you're right!
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Old 08-31-2016, 08:49 PM   #4
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I hope you're right!

Look up a thread I originally posted a few years ago called, Myths about "back-pressure" (sorry I don't know how to post links up)

It's kind of a lengthy read but worth it!..


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Old 09-01-2016, 04:05 AM   #5
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Do you have a tune for the missing cats and COT? That may be why you're smelling gas.
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Old 09-01-2016, 06:07 AM   #6
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Do you have a tune for the missing cats and COT? That may be why you're smelling gas.
Yeah I have everything in my bama tune.
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Old 09-01-2016, 07:01 AM   #7
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You smell gas because you have no cats.
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Old 09-01-2016, 07:16 AM   #8
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You smell gas because you have no cats.
That's what I was thinking, thanks!
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Old 09-01-2016, 07:29 AM   #9
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My 94 was catless. Dang that thing stunk. Wife wouldn't let me park in the basement garage because it stunk the whole house up when I started it.
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Old 09-01-2016, 09:27 AM   #10
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My catless 04 has a slight smell at start up, and it quickly goes away.

And as stated before the whole back pressure myth has gotten out of control. Most people confuse a decrease air velocity with back-pressure when it comes to loss in performance with a new exhaust setup. IE the guy who goes with 4" tubing on a bone stock honda who then blames his loss of tq on no back-pressure...

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Old 09-01-2016, 09:35 AM   #11
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My catless 04 has a slight smell at start up, and it quickly goes away.

And as stated before the whole back pressure myth has gotten out of control. Most people confuse a decrease air velocity with back-pressure when it comes to loss in performance with a new exhaust setup. IE the guy who goes with 4" tubing on a bone stock honda who then blames his loss of tq on no back-pressure...

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+11. Not to mention that the "loss" in power is down low in that case!.. But would still see gains in the mid range and high end too!..


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Old 09-01-2016, 12:30 PM   #12
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+11. Not to mention that the "loss" in power is down low in that case!.. But would still see gains in the mid range and high end too!..
You would actually only see gains by going from say, a 3" pipe to a 4" pipe if you were restricted by the 3" pipe.
The ideal pipe diameter is the smallest size that keeps you at or near zero back pressure. Any bigger and you're giving up the low end with little to no gains up top.


That being said, to answer the OP, straight pipes will not hurt the car (as long as you still have headers with a proper O2 sensor setup). You might lose a small amount of power if you remove the x or h pipe because those actually help quite a lot with scavenging and velocity. The best bet would be to dump right after the mid pipe. These cars sound like a very obnoxious wet fart with straight pipes though... nothing like the old school v8s
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Old 09-01-2016, 05:25 PM   #13
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these sound great with no muffler, but take off the cat or resonator with it and they sound like crap over 3k rpm. IMO you need 2 of the 3 to sound right.
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