Is Open Exhaust Bad For The Engine?

Kilgore Trout · Nov 7, 2006

Am I the only one that is thinking that having no catback at all is pretty damn cheesy?

40th GT · Nov 7, 2006

Kilgore Trout said:
Am I the only one that is thinking that having no catback at all is pretty damn cheesy?

Nope. I don't like the exhaust tone at all when a car has no mufflers.

RoadconeTuning · Nov 8, 2006

you dont need backpressure... backpressure just happens to be a byproduct of creating exhaust gas veolicty... its always a trade off... you can tune the pipe size/length for high rpm and it will be shorter and fatter or you can tune it for low rpm which will be longer and skinnier... when you unbolted your catback all you did was freeup your exhaust... and relieve backpressure and loose low rpm gas speed which is a great thing for highrpm but you suffer in the low end because the exhaust isnt helping to scavenge at such low rpm...

in short your fine it will just sound like ass...

stangGT97 · Nov 8, 2006

jasonh_86 said:
I know!..

But the VT Stage 2's are going back in... getting it done by a reputable shop, the one that tuned the car. They're going to install and degree them and everything.. I hope to get 300rwhp

Going under the knife on December 18th.. so u guys can expect to see results by the 20th

woop woop! Nice dude, hopefully by then I'll have sold my Mustang

jasonh_86 · Nov 8, 2006

stangGT97 said:
woop woop! Nice dude, hopefully by then I'll have sold my Mustang

Selling it?!... How dare you!!!!

shallowreef · Nov 8, 2006

If you guys go to youtube and look up "SLP mustang", you will see my Red mustang on a few of the clips look for stuff posted by "Shallowreef".

I run Full SLP on my car and its great to me. I also have a catted x and LM2. Check it out and let me know what you guys think. I would post it for you but work blocks youtube.

jasonh_86 · Nov 8, 2006

I bet that sounds goooood with the LT's

jstreet0204 · Nov 8, 2006

speedfreak98r said:
Except for your ears

True. It will most likely throw off your fuel trims if the o2's are close to the collector, but they will correct themselves when you put the mid pipe back on.

Duke309 · Nov 8, 2006

Open headers was ungodly loud in my garage, sounded decent, wouldnt want to drive around like that at all though.

How do magnapacks sound with an o/r x?
How about the LM2s?

shallowreef · Nov 8, 2006

LM2s are sweet. They are not that loud at idle but when you step on it oh man is it great!

topless98gt · Nov 8, 2006

Duke309 said:
Open headers was ungodly loud in my garage, sounded decent, wouldnt want to drive around like that at all though.

How do magnapacks sound with an o/r x?
How about the LM2s?

Not sure about the 'packs. We will find out by Friday, hopefully. My 'packs should be coming today. WOOT WOOT!

topless98gt · Nov 8, 2006

Found this video on YouTube:

http://www.youtube.com/watch?v=vrUt1h17gEs

Check it out!! Sounds mother-ef'n bad-ace.

RandyStinchcomb · Nov 8, 2006

should not be a problem, but....my dad who is "old school" make a good point about running open exhaust, esp in the winter where it gets cold. once you shut the car off, cold air is drawn up thru the headers and if cold enought and the exhaust valve is hot enought, it could cause a valve or valves to warp. I've never seen this happen and again this old school thinking but it is something to think about

RoadconeTuning · Nov 8, 2006

RandyStinchcomb said:
should not be a problem, but....my dad who is "old school" make a good point about running open exhaust, esp in the winter where it gets cold. once you shut the car off, cold air is drawn up thru the headers and if cold enought and the exhaust valve is hot enought, it could cause a valve or valves to warp. I've never seen this happen and again this old school thinking but it is something to think about

if you dont think they will warp go out and pull the headers off and run open head.... tach 5k a few tiems then turn it off.... make sure you have a camera ready for the next time you start because its going to make some cool noises...

Warrior 102 · Nov 8, 2006

Vt stage II open header..

http://www.youtube.com/watch?v=1dKo1E-69f0

scupking · Nov 8, 2006

topless98gt said:
Found this video on YouTube:

http://www.youtube.com/watch?v=vrUt1h17gEs

Check it out!! Sounds mother-ef'n bad-ace.

Man I can't wait for my packs tomorrow.

topless98gt · Nov 8, 2006

scupking said:
Man I can't wait for my packs tomorrow.

Mine didn't come today. I guess he did say the "middle" of next week, which would be anywhere from Wed to Sat...I really hope they come soon I can't wait!

We need to compare the sounds since I have O/R X w/ NPI, and you have Catted H w/ PI...they will sound a LOT different!

scupking · Nov 8, 2006

topless98gt said:
Mine didn't come today. I guess he did say the "middle" of next week, which would be anywhere from Wed to Sat...I really hope they come soon I can't wait!

We need to compare the sounds since I have O/R X w/ NPI, and you have Catted H w/ PI...they will sound a LOT different!

Yes they will. There is anohter guy that is getting the packs and he has a prochamber. All three of us will have a different sound.

AmBo · Nov 9, 2006

Prochamber ftw!

scupking · Nov 9, 2006

Just got home from work and had 2 packages sitting on the front steps. I called Midas and I told them I would come in after work tomorrow. They sounded excited about installing them.

Is Open Exhaust Bad For The Engine?

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