N/A Max Power

[WarmAndSCSI]

What Seth posted is right, but back pressure is a product of exhaust diameter and length like I said before.

Just make a hole with your hand and blow through it. It gets easier to blow through when you loosen your grip and increase the diameter, doesn't it? Same if you place both of your hands together and then shorten the path the air has to travel by removing one hand. More flow capacity = less back pressure. And back pressure creates flow restriction as you can feel with this simple demonstration.

[duh2150]

stock pipnig is fine for a reg n/a accualy i think for any n/a unless your reving to like the moon, for boring it out it should be slightly bigger, wit ha turbo you wnt it way wideer the an 1/8 an inch, do to the fact it shoves a ton of air into the engine, a ton of air has to come out, make more pressure in the same tubing, and too pressure much is always bad and you lose lots of performance and bog down, like and this goes for alot of things it just bepends on how you look at it
"you cant shove 10 pounds of crap in a 5 pound bag"
so you have to get a second bag, or big a 10 pound bag, in this case you can find a way to make 2 small pipings or just make it larger, same goes for intake you cant suck 100 cfm threw a 5 cfm hole, thats why you buy a turbo, but still cant shove it in there fast enoth under higher conditions

[WarmAndSCSI]

Stock piping isn't good because it has tons of restrictions. Just look at it. However, mandrel bent 2.25" piping with a free-flowing cat and muffler would be ideal for a 2.4L N/A setup.

[duh2150]

well i mean a stock n/a lol its made for the car, porbably change the muffler and chhange ot uthe cat, and it would be set for a stock engine

[WarmAndSCSI]

Yes, it's made for the car, but Mitsubishi has to cut corners to keep costs down. IE: the pipe bends SUCK and you'd benefit from a mandrel-bent system even on a stock 4G64.

[duh2150]

true but i mean do the same size piping is stock a little bit wider for a blown out n/a, plus if your gonan widen it you gotta widen everything on the exahust including headers and shit, everything smaller then what you widened will create some kind of pressure change at that spot, for instance gonig 3 inch from headers to the stock muffler it will do no good

higher pressure form the engine then to a lower pressure tubing(aka widened) if widening it widin the whole thing from the edges of the header that touch the engine to the tip on the muffler

[6G72gearhead]

The fewer bends you have the less restriction with smaller pipeing. A well thought out exhaust system would ideally use the fewest bends to get the gasses out from under the car, while using a pipeing tuned to the powerband of the engine.

[duh2150]

yeah to big is bad is what im trying to say