Backpressure

[Archangel]

So, last night I flushed my PS and upgraded it with a cooler, then I got bored, that progressed in stupidity, and the whole thing ended up with my car having no exhaust pipes after the cats. That's right, everything behind the cats is gone - the Y-pipe, the muffler, the tail pipe, everything It's pretty damn loud, but not abnoxiously loud so that I get pulled over. Now it seems that my guilty concience is getting back to me, so I oughttaask - is running so little backpressure (basically only the one created by the cats and the manifolds) gonna screw up something on the engine?

[Lincolnmania]

you wont hurt a thing mang.............just dont sit in the car with it idling and the windows closed lol

[Blaze86Vic]

Yeah, no problems man.

[Southern_Pride]

Ive almost always ran my cars that way. In my opinion its still to quiet.

[gadget73]

those quad cats muffle things a lot. Did a water pump one one with just the H pipe and no mufflers and it sounded like it had mufflers on it still.

[Archangel]

Aight, guys, thansk - open pipes it is for now. I have a cat-less dual exhaust I snatched from a junked cop car, I'm thinking of doing that with some small mufflers and pipes exitting before the rear tires, but that'll have to wait as I have some more urgent projects with the car.

As for the loudness - a kid at my school has an '89 Mustang LX with sideipes and no cats, and his car with the 2.5" Flowmasters sounds exactly like mine with cats only

[grandpaslincoln]

Back in the day when I had single exhaust, I everything behind the cats just for shits and giggles. That damn thing was loud! Vibrated my ass and made it hard to hear other people inside the cabin lol

[Archangel]

Here's how it looks now (clicky):


GL, I have no problem making a conversation in the car, not really that loud. Until I floor it, that is :evil:

[grandpaslincoln]

Ahhh, I see why. I didn't have downturns bolted on, it was just dumping under the car :drug:

[nitroracer]

I drove my car with just an h-pipe for a few days and even with cats that thing killed my ears. Doing 70-75 on the highway with an exhaust that dumped right below your seats was friggen hell.

But I must say, the super turbos I have on there now aren't noisy enough.

[Chachi]

only 4 bangers need back pressure

[Archangel]

Nitroracer, did you have any turndowns? I made mine by just cutting the old Y-pipe and swapping the left and the right, and although they're just a 45-degree bend they make a huge difference - the car is still decently loud on the outside, but inside is much better, I listen to my music just as loud/quiet as before, and I can hold a normal conversation without even raising my voice. Don't have to yell in the cell phone either The only thing I don't like too much is the low-frequency boom-boom rumble at low RPMs, but after driving at 45 (so basically idling in overdrive) for like 5-10 minutes it no-longer bothers me.

Chachi, I like your thinking. And taste for beer too

[N A]

I sawed off my exhaust right after the Y-Pipe. It's loud at start up early in the morning (5am) when I leave for work. Now that it's colder outside, I don't like the exhaust blowing forward if there's a tailwind at a light. Looks like the car is on fire. I'll be finishing the exhaust soon. I love to look of cars with dual tail pipes when it's cold outside.

[grandpaslincoln]

:stupid:

[Archangel]

And WTF would be the point to ditch the muffler and the tailpipe, but to keep the Y-pipe? Low-end torque doesn't suffer much if you remove everything completely, besides now you're just dumping hot exhaust gases straight towards the tank, or at least the pressurized fuel line...