R34 Gtt Exhaust Questions

[Haxorz]

Hi guys,

I'm looking at an R34 GTT for sale and am close to purchase.

Here is a photo of the exhaust.

This is a Nizmo factory option, right? I've been on Prestiges list long enough to learn most of the factory options and am pretty sure it is. It also has that interior 'Sports / Silent' switch in the cabin under the steering wheel to the right.

My current R33 has a custom 3" from turbo to cat then a HKS 3.5" cat back + an Apexi air pod and has 160rwkw. This R34 didn't seem to go as hard (it just has this exhaust, no pod or other power mods), but maybe cause it was newer and smoother? Dunno. Thought it was strange though cause the R34 supposed to have a few extra KW's over an R33. Anyway, my questions:

- Can anyone tell what size this exhaust is? 2.5"? 3"?

- Does anyone know anything more about this spec of exhaust?

- The dump/front pipe is still the standard (restrictive one) right?

- Is it worth replacing with a 3 or 3.5" exhaust?

- Is there a big power difference between 'silent' and 'sports'?

- Dummy question here - will an R33 cat back system fit an R34?

Edited March 27, 2006 by McCracken

[666DAN]

Yes it was a Nizmo option, the exhaust basically sucks so replace it with a decent flowing turbo-back system.

[Abo Bob]

3" is all you need.

[Bass Junky]

Yeah, the silent/sports thing is a butterfly flap in the read muffler.

It's really only for sound and that's it.

Also, it tends to seize all the time because of the heat of the exhaust.

You will most likely replace it with a 3" turbo back anyway.

Then you can use the button for NAWS!

[Haxorz]

I'll have to measure it.

I guess what I'm trying to figure out is am I getting bang for my buck spending the $850 - $1,100 on replacing this exhaust with a new cat back system.

There is no doubt I'll be getting a front/dump pipe regardless.

I mean, if this is 3" but it's not 'as optimal as it could be', surely spending a grand on the car for just a small improvement isn't worth it.

If it's only 2.5" then that's another story I guess. I posted some pics in the original post, were these deleted by mods? I shrunk them and everything!

[Abo Bob]

I'll have to measure it.

I guess what I'm trying to figure out is am I getting bang for my buck spending the $850 - $1,100 on replacing this exhaust with a new cat back system.

There is no doubt I'll be getting a front/dump pipe regardless.

I mean, if this is 3" but it's not 'as optimal as it could be', surely spending a grand on the car for just a small improvement isn't worth it.

If it's only 2.5" then that's another story I guess. I posted some pics in the original post, were these deleted by mods? I shrunk them and everything!

It is only 2.5" so get a full 3" system on there and forget what's there now.

[illusiVe]

my r34 im buying has this exhaust, im going to keep the flap, but upgrade to aftermarket 3.5" within 1st 3 weeks of owning the car hopefully.

but this 34 nizmo exhaust is alot better than the standard gtt exhaust

Edited March 27, 2006 by illusiVe

[gt-t_r34]

and r33 want fit r34 you'll have to get the flange changed

[Haxorz]

my r34 im buying has this exhaust, im going to keep the flap, but upgrade to aftermarket 3.5" within 1st 3 weeks of owning the car hopefully.

but this 34 nizmo exhaust is alot better than the standard gtt exhaust

Good to know its much better - I would have thought so. I added several kw just by doing a rear muffler change on a 200sx once.

Does anyone know if it's possible to weld a custom 3" exhaust up to this Nizmo rear muffler? Or won't this work as this muffler has a 2.5" inlet? It looks like its a great muffler and I don't want to have to throw it away, that's all.

[ed]

Why not just get an x-force turbo back? Best bang for buck IMO.

[illusiVe]

its the whole thing of having the quiet/loud option.. thats the only reason why i wouldnt want to get rid of it.

i plan on making the flap compatible with my new 3.5" exhaust.

also if u get xforce, i think it doesnt come with a dump pipe, only front pipe etc..

could be wrong .. if im right, atleast u could make preperations to spend on dump pipe.

[nuffsaid]

I had the same problem.

Got rid of the muffler and upgraded exhaust to 3" one since the muffler is only 2.5". Great power improvement but was a bit loud for me,

So I put on the old muffler with my 3" system, shame though, I need a bit of 2.5" piping to connect it to the 3" resonator and the rest of the piping.

Found it to be very restrictive! that nismo muffler is very restrictive, even though its Nismo, I see it more as a factory upgrade rather than a performance aftermarket part.

Save your money for a proper muffler and system (3 or 3.5") and keep this nismo muffler on the side just in case you need to go back to stock for whatever reason (defects).

Thats what I am doing, trying to get a proper 3" muffler now because with the big exhaust, the full exhaust was getting me about 11psi boost. With ONLY the nismo muffler put back on (i left the 3" dump pipes etc etc), boost decreased to about 8or 9 psi. So I see this exhaust as a major restriction.

If you want the quiet loud option, get an ECV.

With this muffler, quiet is quiet, loud is quiet, you cant really tell the difference.

[Haxorz]

Thanks mate, this is exactly the information I was after. Looks like that whole system is about to become a garage decoration if I get that car.

Guess I’ll just have to budget in about $1800 for a good full system when I’m comparing other vehilces. That damn exhaust sure does add up when you add dump + front + cat + cat back + fitting. Doh.

[Haxorz]

Just got the exhaust checked out. It is a piece of crap - verified! It has two pipes going into the muffler, one of them is about as big as a 20c piece and the other maybe as big as a golf ball (no joke).

The valve just closes one of the pipes.

[illusiVe]

i thought nismo would do better than that... oh well.. still a cool feature none the less

just modify it.. cut the pipe OFF after the valve.. so its straight to atmo

then the fun begins.