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Thread: ZX5, Cut the muffler off, now having issues Reply to Thread
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Topic Review (Newest First)
07-12-2016 02:03 AM
amc49 Why on earth are you willing to mess with your new car warranty like that, not wise. Having no money to fix your possible result AND no warranty...........even less wise. Non expensive exhaust? Try the one on the car...............

Testosterone, creator of broken cars, endless wars, and eventually the end of the entire freakin' planet. Heaven help us all that anything like good sense should get in the way of that.

07-11-2016 09:39 PM
slow_solo_focus All good, next time make your own thread. If you guess the wrong thread we'll make sure it gets to the right spot for the best help.

Sent from a man reunited with his focus
07-11-2016 09:26 PM
Fred_Da_Focus thanks guys im kinda new to this so im still learning haha
07-11-2016 05:05 PM
slow_solo_focus There is a whole thread here you could read to learn a fair amount too.

To answer your question, Gains will be minimal other than noise.

Sent from a man reunited with his focus
07-11-2016 06:08 AM
sailor Fred_Da_Focus - wrong place for exh. modification info. for your car, Durartec TiVCT Performance section for your engine/model.
07-11-2016 03:37 AM
amc49 It really does nothing but zero the police in on you like nothing else...........
07-10-2016 11:54 PM
Fred_Da_Focus i have a 2016 focus se and have been wanting to do some type of exhaust mods but have no money at the moment. i thought about cutting the muffler out of my car as well and was curious to if i would lose and performance or lack of power??? i eventually want to do a full exhaust too so if you have any non expensive ones in mind that would be awesome!!!
05-12-2013 02:36 AM
amc49 It's actually the law in most places................
05-11-2013 07:26 PM
cheap sleeper concerning the smell of exhaust, it is from the exhaust pipe no longer being long enough to vent AFTER the rear bumper. The exhaust is billowing under the car and creeping up into the cabin. If you MUST not have a muffler, then you need to extend the pipe to its original exit length just past the rear bumper
05-01-2013 02:05 AM
amc49 The back pressure thing is pretty much a myth. Under certain circumstances you can burn valve (warp it) by cold air aspiration, meaning pipe would have to be a couple feet long only or shorter. A big crack at the head flange can do it. The negative wave sucks back cold air, which the hot valves don't like at all. As far as back pressure, I used to race plenty of stuff and never ran across one single engine type that didn't run better with shorter exhaust provided it was properly designed. A properly designed exhaust header just screams to be open, the difference in power can be very marked. Wave extraction tuning, and all that...............the exhaust when running best will actually be in vacuum conditions part of the time. That fact spits 'necessary back pressure' out on the floor. I've built headered street cars that ran around at 15 inches of mercury at long cruise, measured in the collector. No back pressure there, rather, the opposite.

Or, as iminhell says, that works for me too. Especially as far as young kid romping on the gas to lower MPG. Loud pipes and the lower MPG are drenched in testosterone, and inseparable. I remember doing the same on my Bridgestone (yes, the tire people, they used to make motorcycles) bike in '66, everybody yanked baffles back then to 'hear it talk'. I absolutely guarantee I used way more gas than I should've too.

Much back pressure increase is done to quiet the exhaust note, or the reason why exhaust is constantly rammed against itself in mufflers that reverse flow. All that crashing breaks up sound waves. One big reason why single exhaust is quieter than duals, the waves interfere with each other more.
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