No muffs?
 

Hay, anyone out there running str8 pipes on your 4.6? I've been told that the 4.6 sounds great that way.

You'll lose power

yeh.. ya need some back pressure on a stock engine...

the only time ya run straight pipes is w/ a HIGH performance engine...

You still have the cats. Thats back pressure.

if you have cats then it isnt a straight pipe...

cats only sound like ****... or at least i think they do...

take off the cats and get a set of magna packs or borlas

I ran straight pipes on my 99 gt with cats. Every one said it sounded great but it was really loud in the car i couldent stand it any more and I lost power and it killed my gas mileage. I took it off after about 2 months and got a flowmaster cat back.

Yeah, no mufflers are really annoyingly loud. I got flowmaster 40's and love em.

i allso have 40's w/ 2 1/2 inch piping LOVE IT!

backpressure is a myth. you dont need it. the more free flowing an exhaust the more power. it will sound OK at WOT but it will sound like **** otherwise. i ran stock manifolds with an OR Xpipe only at one point

i think it sounds good.so do a lot of people..

my car with no muffs...

http://videos.streetfire.net/Player....6-3963618B1EA4

not a myth...

you need some backpressure on a stock engine... the only time that straight pipes are the right road is with a modified engine... on a stock 4.6... straight pipes will counter prductive

:icon_bs:

backpressure = torque

my automotive instructor builds dragster cars, thats the one thing the whole crew knew and always said.

You need backpressure. Dyno results also prove it.

show me some dyno results.

youre wrong , sorry

scavenging exhaust gasses from a motor at a higher velocity will make more power than scavenging gasses at a lower velocity. tuning a header collector for diameter, length etc is to allow it to propel these gasses from the motor faster. some people confuse this for reasons of "backpressure" when in fact a 5 inch tube may not always flow air faster than a 2 inch tube. just as intake manifold runners are designed to flow air as fast as possible into the motor, the headers are designed to flow air away as fast as possible. never would you want to clog up your motor with air that was already used and not useable. you people are idiots. thanks.

if your losing power or torque by removing mufflers, its not because you lost BACKPRESSURE. your motor will always make pressure its called combustion. the reason you MAY lose power or torque is because your stock or barely modified engine isnt making enough exhaust gas to flow at peak speed through your exhaust system. the exhaust gas now tumbles and collides in the piping. if you were to remove your mufflers and decrease your exhaust pipe diameter you would see higher power numbers.

Correct. also for you guys who say straight pipes lose power what do you think the inside of a SLP loudmouth,magnaflwo or any other straight threw muffler looks like? its straight threw with sound deaded material around it (minus the slp setup). while it wont hurt power unles you arent making power, it does in my opinon sound liek crap its just alot of noise not music.

was that statement really needed?? im just curious because i guess we werent all born with this knowledge

it wasnt directed at you. it was directed to the people who assumed they had the knowledge. anyone simply asking a question is NOT an idiot

No mufflers on my ride. Personally, i dont think it is annoying loud. Actually, when she is at idle she purrs like a tiger. <grin> When you go WOT and hit the higher RPM's it is loud as all hell.

So i got a Xpipe and no muffs, but i do have cats. I diddnt notice any drop in power or drop in fuel economy, i diddnt notice any increase in anything either except for the volume of the exhaust, which is fine with me. My setup ran me 250.00 welded in place and fabricated by a custom exhaust shop.

so did you have a complete catback made without mufflers? or did you just weld in straight pipes? if your going to spend 400 bucks on slp exhaust your better off just doing as jack the ripper did and saving some bucks and some weight. also you wont have big redneck tips. :)

Actually, what i got was a 3inxpipe welded in place with 18in x 3.5in diameter chrome 45 degree angle tips.

Honestly, i wasnt concerned about gaining power, i just wanted that V8 to be nice'n'loud.
I dont think i gained any performance, but i certainly diddnt lose any either. It took these guys about 45 min to do the whole install job, they did a bitchin welding job too.

with exhaust mods usually you woulnt be able to feel a difference. sometimes the sound can trick you into feeling one way over another. now headers are a different story :)

Yah, honestly i diddnt feel crap except some nice DB when i got on it.

I oughta look into headers someday.... still need to get my gears done first though

It would be different if we were talking about dragster's, but were not. Mufflers will not make backpressure, so if you remove them, there wont be a difference.

If I were to dyno a car with and without cats, youd noticed the dyno run with cats will pump out a whole killing 2-3 extra pounds of torque, while decreasing hp by 2-3. Aand vice versa, with no cats.

Obviously nothing the ass dyno will pickup. Nor do I really care, Im just simply stating that backpressure will make a few extra pounds of torque, while sacrificing a little horsepower.

Its not like I dont know wtf im talking about, im a technician for a stealership, i meant, dealership.

he must know his **** hes a mechanic at a dealership...and they build and tune race cars there right?

:ban:

Damn! Tell ya what, Dom definatly has the ability to be an asshole, but that definatly wasnt called for. "I hope you die in a high speed accident"???? Christ. What kind of a piece of **** are you?

Hey Dom, yer an asshole, but yer my type of asshole.
This guy is just a worthless prick.

dom comment was pretty dick tho... the guy was agreein w/ him to a point and dom just offended him for almost no reason...

i never hoped for your death. but if you cant take an insult. yoour a *****. sell your car andd get a chevy

He's 17 years old what do you expect he's no better than Springs..........automotive service technician...he probably changes oil and balances tires...or even better washes cars...oooooo...I could care less what he does for a living or what he knows all I know is newbes DONT NEED TO BE SAYING D*** THINGS

Mufflers are overrated. I tossed mines a long time ago....I'm running open headers.. :devil2:

Damn boys, I just ask if anyone was running with out mufflers. I bought my stang that way and wandered if its the norm. Don't make me bi#*& slap you kids.