no muffler just header and downpipe??!!

[addict_cb7]

okay, so anyways one of my friends gave me a import muffler to put on my car and has a 3.5 inch ending on it. anyways he decided to give me a glass pack as well and he put it on there. only problem was is that his welding is not the best and he was only able to weld half way around it. now i thought a glass pack was a type of muffler but what he did is cut off the catalytic converter and welded the glass pack on there and when he did his half job of putting it on there, i decided to just take off the entire thing and redue it. well i didnt have time and now i have it just running off of the header and downpipe. the downpipe being by itself sounded really ugly and loud so i put my import muffler on the bendy metal part of the downpipe. now i know that 4 cylinder engines need back pressure but is this an ok rigging or no? i need to know the best way to do with what i have. i am able to put the glasspack and import muffler back the way it was. but i really dont want to. i just need to know if this rig will screw up my engine valves or something.

[quickangel93]

first of all

whats a glasspack?

you need a exhaust system or your loose lots of power

you could run it like that, if you want to get your car impounded for poluting air and causing public disruption.

if you cant figure something out, just put your stock system on, until you could figure it out.

[npor]

i'm sure you can get a ticket for it or something. but your friend sounds like an idiot.

but it won't hurt your car. people run open exhausts all the time thinking it gives them more power.

go to a local exhaust shop and get them to put the right stuff on. just tell them you need to replace the exhaust from the downpipe back.

get 2.5" piping while you're at it. it certainly can't hurt.

[rossisalvage]

My friend ran his integra gsr with only a header and downpipe for 3 months, everything was fine until he got a big ass ticket. Then he bought a greddy evo2 catback and realized he was losing a decent amount of power running without an exhaust. Id take it to an exhaust shop if i were you rather then half ass it

[addict_cb7]

Yeah About The Ticket Thing. The Only Ticket I Would Get Is Noise Disruption. Lol Lucky For Me We Have No Emission Testing Here. So It Is Fine To Run It That Way? It Wont Bend Valves Or Anything

[kelton]

When I had my car setup like that when my exhaust got ripped off i was getting pulled over like on a daily basis.. so definetly get some sort of exhaust on there.

[K2e2vin]

Sound level depends on county or state. Over here you can get away with a loud exhaust. Only thing is it's loud and annoying.

If I were you, I'd put a cat on there just to quiet it some a little. A glasspack would make it sound meaner, but useless if the exhaust is leaking.

Whoever says cars need backpressure don't really know what they're talking about. You don't want any backpressure at all but you also don't want it too big which would cause turbulence. The same theory applies with intakes, if you can get it moving at a high enough velocity without back pressure, you'll notice gains due to scavenging effects. Backpressure=less power since it'll actually take "work" to push the exhaust out.

[low92]

hey im running header and open downpipe and its been this way for 5-6months no problems yet just gets on my nerves now. But i just left a shop and they are gonna do 2.5 all the way back to my dual mufflers for $175 so just go to a shop ad get it done

[deevergote]

The fumes can get to you if you sit at idle for a while... but otherwise, the noise is all you need to worry about.


Cars do NOT need backpressure (why does everyone keep saying they do as a fact?). You want the most exhaust flow at the highest possible velocity... Backpressure does NOTHING good. Ever.

Flow velocity is key, and that's where a good header and exhaust come into play. It's better to have a system that promotes greater flow velocity (look up "scavenging effects") than it is to just have open exhaust ports.



Just get a proper exhaust system... and NEVER let your friend touch your car again!