Disadvantage on 2.5inch all the way exhaust?

[Evok]

Alot of info, thanks guys

I'm not modding it for the sake of it...actually want some more power out of the engine and all..on student funds too so i don't really want to spend all my money on the car else ill be struggling to even afford the car..

right now i think 2.5 from everyone views and opinion is a good go...althought i did want 2.25 from what most people was saying.
Its guna be really loud but i guess ill just change the muffler later on

Thanks guys!

[bennjamin]

Doesn't a dc2 ITR have 2.25 cat-back piping , and 14kw more peak power ? ( plus is tuned to it)

Just sayin'

[dougie_504]

^
This is why I recommend to some people that they get an ITR exhaust for their dc4/dc2 but I usually meet a lot of opposition. Mandrel bent too I believe.

[GSi_PSi]

Ben, I don't think the exhaust is contributing any power gains by being at 2.25 inch vs VTiR...
Things like bigger cams, bigger intake manifold ,throttle body ,mild port work on intake, 11:1 compression might have something to do with it though lol.

Anyways it doesn't really that much of a difference anyway, as said 2.5 tuned with a tunable ecu will give you more power , and you faggots that negged me in my post earlier show me one dyno on a b series motor where power was actually lost going bigger and I'll eat 10 hats.

It's even been proven 3 inch vs 2.25 inch on a b18c makes more power everywhere this guy has a b18cr motor With just cams , made 10hp extra only thing he did was change the exhaust .

[meatball]

^
This is why I recommend to some people that they get an ITR exhaust for their dc4/dc2 but I usually meet a lot of opposition. Mandrel bent too I believe.

and its stainless steel aswell i think.

[vaikis]

go for 2.5 if you whant not too loud or take 3 for great sound

[bennjamin]

Ben, I don't think the exhaust is contributing any power gains by being at 2.25 inch vs VTiR...
Things like bigger cams, bigger intake manifold ,throttle body ,mild port work on intake, 11:1 compression might have something to do with it though lol.

Anyways it doesn't really that much of a difference anyway, as said 2.5 tuned with a tunable ecu will give you more power , and you faggots that negged me in my post earlier show me one dyno on a b series motor where power was actually lost going bigger and I'll eat 10 hats.

It's even been proven 3 inch vs 2.25 inch on a b18c makes more power everywhere this guy has a b18cr motor With just cams , made 10hp extra only thing he did was change the exhaust .

Sam you just said the exhaust isn't contributing that much to power gains - and that it's more to the engine/tune which we can all agree. Why are you suggesting a 2.5 or 3 inch exhaust on a 1.8 with little or no modifications or tune ?
Saying its proven doesn't mean it's actually proven - US are known for inflating numbers and altering dyno readouts and software variables ( for the customers peice of mind and competition!)


A final answer to the OP - if it's a free or cheap exhaust system - go for it. It will be louder , and you will lose a little bottom end and throttle response. You will gain a few kw's in the upper range ( apparently important to most people in this thread !)
So go nuts ! It's your car dude

[Evok]

Thanks to more people contributing to my question!

Didn't realize how serious this has gotten from 2.25 to 3 INCH EXHAUST TALK!
Haha interesting though!

Yeah it seems i should just go for it. I might be a tune later and other mods later thought due to student funds!

Cheers!

[dougie_504]

If you're going to tune and do other mods later then I'd consider a 60mm (2.5") if I were you.

I have trouble deciding what to believe. I respect a lot of people in this thread so it's hard to decide - is back-pressure real? If yes, is it relevant? Blah blah blah.


All I can tell you is that I put a brand new XForce 4-2-1 header on my brother's DC4 GSI with B18B2. It has a 2" collector. Then we mated that to a 60mm used magnaflow high-flow cat (CEL unknown) which was already bolted to a 60mm Fujitsubo Power Getter. He firmly states (just asked him now) that the car feels better, pulls/picks up better and sounds better, and is therefore 100% happy. Obviously it will depend on who makes the exhaust - Fujitsubo and some other JDM brands just make very good products and most of them are 60mm.

But for me I'd still be wary of getting something like a 3". Again, I don't know the evidence backwards, but it just seems extreme. So if I were you I'd go 60mm. It seems to be the size of choice for JDM brands and especially if you want to do more mods later. I'll bet you don't regret it.

[dougie_504]

...

Bro thanks for the input, but are you sure that guy only has cams?

2.25" or 3", either one, it seems that the figures are quite high for such a simple setup in a B18C7. That's K-series power pretty much...

[TheSaint]

^
This is why I recommend to some people that they get an ITR exhaust for their dc4/dc2 but I usually meet a lot of opposition. Mandrel bent too I believe.

this ^^
i ordered a mugen catback from Japan for my Dc2 - cost like $1550 back in the day
in hindsight i think i should have just got a JDM ITR exhaust, a hi-flow cat and a good JDM brand set of headers
but meh that was years ago lol

[GSi_PSi]

andy- its usa dyno figures bro they always ready higher..