Exhaust Sizes

Gemini Driving Yobbo · petrol head Joined: 26 Feb 2002 Posts: 3897

Yo guys, i was wondering what would be the best size exhaust to get 2,2 1/4 or a 2 1/2. And does a 2 1/2 sound to big and like shit??????

Ben Wight · backyard mechanic Joined: 04 Oct 2001 Posts: 946

Why not get a 4" exhaust?

Hamal · tinkerer Joined: 14 Dec 2001 Posts: 64

I thought 2.5" is good for a NA 4 cylinder car (from what I've read in magazines, and in this forum), but I also heard that for a turbo, more is always better Razz

zzz · petrol head Joined: 16 Jan 2002 Posts: 1298

from what i understand 2or2and1/4 inch systems are best for non turbos because they need back pressure turbos are the oppiste and 2 1/2 or 3 inch is better

zzz · petrol head Joined: 16 Jan 2002 Posts: 1298

from what i understand 2or2and1/4 inch systems are best for non turbos because they need back pressure turbos are the oppiste and 2 1/2 or 3 inch is better

Ben Wight · backyard mechanic Joined: 04 Oct 2001 Posts: 946

Yep, thats right, the more back pressure the better.

That's what my Paw used to saay!
(said with southern accent)

rob_w · tinkerer Joined: 19 Feb 2002 Posts: 395

Get 4-2-1 2" headers/extractors, 2" pipe to a "double offset straight thru" sigle muffler. good power, great note, cheap pipe, good value.
rob.

Gene FJ20DET · Posted: Thu Mar 14, 2002 12:59 am Post subject: Re: Exhaust Sizes

no i think thats a bit wrong. so u are saying more the better. so if i put a 1inch system on i will go faster?!?!?! i think not!. i have a very worked 1.8 engin and had a 2.25 inch system and them went to a 2.5 inch system and fuck i got heaps more outta the car, and i got an extra 70-80km per tank of gas!!!! was great!! go the 2.5inch it sounds fuckin mad!!!!!!!!!
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Gene FJ20DET · Posted: Thu Mar 14, 2002 1:16 am Post subject: Re: Exhaust Sizes

tuned extractors, 2.5inch pipe, lucky turbo muffler, chrome dump tip. $390 sounds filth and i got 70-80km extra to a tank
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Benjamin · backyard mechanic Joined: 05 Oct 2001 Posts: 525

Tuned extractors, 2.25" pipe, Redback high flow muffler, small hotdog on tail with 3" exit, slash cut for discretion.
Pipe hugs the body so I can go low with no fear, $450 all up a few years ago.
Sounds fat and I can still get 600km to a tank of fuel Smile

Gold TX Sleeper · backyard mechanic Joined: 05 Feb 2002 Posts: 509

Rob, what's the dealio with a "double offset straight thru" ? Is That when the muffler has it's inlet and outlet on opposite sides ? This is what i'm assuming with the muffler having the pipe going straight thru diagonally inside the muffler without hitting any baffles, turns etc.
Is this right ?
Cheers,
Jasyn...

MatMan · tinkerer Joined: 04 Oct 2001 Posts: 280

More back-pressure is definately not the way to go. No engines LIKE backpressure, this is a common myth, much more important is the accoustics of the exhaust (IE, reversion and whatnot), but on a gemmy engine, a 2 1/4 or 2 1/2 would be best.

Gene FJ20DET · Posted: Sat Mar 16, 2002 12:34 am Post subject: Re: Exhaust Sizes

600!!!!!!!!!!!!!! wow!!! im lucky to get 450km/ per tank!!!
maybe the rediculessly large cam has something to do with it?!?!?! heheheh
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Ben Wight · backyard mechanic Joined: 04 Oct 2001 Posts: 946

I'm telling you guys, my Paw (southern accent once again) used to work for ferrari in their native land of Spain, the smaller the exhaust on their F355's, the more power they used to make at the spare wheel!