2 Inch Straight Through Exhaust

[nisskid]

I'm hooking up a home job straight through exhaust without cat, muffler ect and just wondering what kind of performance increase (if any) i can expect with a 3k engine. also I'm worried about how loud its gonna be, any ideas?

 

cheers

[coln72]

performance gain = s.f.a

 

noise = LOUD

 

had something similar on a motorkhana car and it did nothing.

[Hiro Protagonist]

Billie (our 55) has effectively got a straight through exhaust, just a huge-ass cannon on the back that I think does SFA to lowering the sound. Gave me quite a shock when I stuck my head under there and just saw a long unbroken pipe running straight from the exhaust manifold to the back of the car. The guy I bought it off said he did it as practice for a project he was working on, and everything has held up fine (plus it passed rego, although I doubt the EPA would like it).

 

As for performance gain, wouldn't have a clue as I haven't driven the car with a stock exhaust, but considering the minimal amount of power in a K series anyway, and the big restriction of the 8V non-crossflow head, I seriously doubt there is a lot of power locked away in the exhaust

[nisskid]

so maybe jsut straight through from midway, so keep the cat and just take replace it after it loops over the axle just before the muffler? my mate just got a 84 corrolla and took the exhaust straight off and they rekon the performance increase is amazing, would be a different engine i guess.

[coln72]

don't get performance gain and noise gain mixed up. If its faster against a stopwatch them good luck to you.

 

Running events straight out of the engine pipe (don't ask) did not seem to improve anything either.

 

Best system I had was a set of 4-1 extractors, a 2" pipe that went under the diff housing into a 2nd hand muffler with a 3" pipe welded to it :lock_folder:

 

That gets people scratching their heads about whats in it. Lost count of the "how does the rotary go?" comments

[Corolla_Kid]

3ks don't have cat converters bro.

[nisskid]

yeh i guess I'm used to looking at different cars, but usually i would think running a straight pipe through instead of having mufflers and other restriction would help performance.

[Redwarf]

It's a 3K. It'll make bugger all difference. I should know, I've built a few.

 

Put a straight through muffler on it, that way it might end up somewhere near legal.

[86ONE]

mines a 4k with 4 - 1 extractors and 2 inch with resonator and cannon.

 

dunno if it makes any more power but it reached 110dB on a radioshack dB meter at roughly 3 feet away lol

[Robert]

wank factor :lock: :lock_folder:

[Guest Brad]

Well said Robert.

[Rollin-Rolla]

seriously as people have said, its only a 3k motor, no point in doing it.

 

probably the biggest waste of time since night shade on tail lights.

[nisskid]

lol, yeh like i said before, I'm not used to these engines.

[Sidewinder]

I'm only intersted in doing my exhaust to achieve a certain sound I'm chasing..

 

you know how some exhausts have a bit of a "bubble" (probably the wrong word for it) as they go up the revs?

 

i originally thought it was a cannon that did this, but all that does it make it loud, and much

deeper than i want it to be....how do i get that bubble?

[nisskid]

^^like a gurgle? from my experiences cannons arnt good for anything but drone.