Bog Stock R33 - To Turbo Back Or (hi-flow) Cat Back The Exhaust

[TALBO]

Hi guys,

I've had my R33 S1.5 now for nearly 3 months and have brought up the 5K..... so dealer warranty is now gone. In december I bought an Apexi N1 Evolution cat back from a forum member here and have waited 'til the 5K came up.

Now I've been reading countless threads (I know this has all been covered before... sprt of) in the mean time on the pro's of going a full turbo back system and all the threads on bell mouth Vs split dump front pipes and the general consensus there is that with anything under 300rwkw it doesn't matter what type so long as you get rid of the restrictive stock dump/front setup.

So my real question here is that I've also read posts here that state on a bog standard setup going for a 3" dump front will actually lose you power and create more lag and potentially over boosting issues and I'm wanting to know baically is it worth it to go for an aftermarket dump front pipe (alongside the catback and a hi flow cat), or will I get better response with the stock dump front pipe? Are those guys right when they say you lose power?

I don't plan on fitting aftermarket turbo or intercooler and want to keep mods to a minimum (ie. exhaust and a K&N or Apexi panel filter, might do the <4500RPM boost mod).

Thanks in advance

[EeLeYe]

I and many others have put a full 3' turbo-back system (+ a high flow air intake) on a stock skyline and have been extremely happy with the change in performance. If anything, engine response will increase and the boost will rise ~2 psi as well. I noticed no difference in lag at all.

So make the change. If you're not happy with it you could always change it back but I doubt you would even want to.

[RBwhatever]

turbo back. there is no other way you should go.

[geraus]

Bro! The rb25's engine is a sweet sounding engine but very quiet in standard form about

(88.9dB @ 4800 rev/min,this is my exhaust by the way when i got pulled over by EPA! and had to get it re-tested! with just the stock catback!) and as with most factory turbo cars the exhaust causes a huge restriction. A good free flowing exhaust will have the RB sounding great, turbo lag will be

reduced, and power gained throughout the rev range.

The new exhaust should start from the turbo with a dump pipe either a 3" open bell mouth or

better still a split dump to separate the gases from the turbine and wastegate. From here a high quality 3" high flow cat should be used, then 3" all the way to the back of the car with high flow mufflers.

thats my 2cents

GReddy PE II FTW!

[TiTAN]

If you are going to only be doing minimal mods something like an Xforce exhaust will be fine and isn't overly expensive (mine is happily pushing 200kw @ the rears on the stock turbo with one) as for the bell mouth vs split dump, again 200kw they are both going to give a good result and you wont notice much difference between the two.

[Ultimategtr]

+1 to above.

I think people confuse response with Lag. i found out personally that after installing a full dump/front i lost a wee bit of response down low, however it surely made up for it up top.

[TALBO]

Thanks guys, looks like I'll go turbo back.

I already have an Apexi N1 Evolution catback ready to go on and I'll get one of those Catco hi flow cats from jjr, now just going to pick out a dump front pipe.......

AM Performance

JJR

CES

Any others worth considering?

[ashneel]

on my R33 series2 i had the Just Jap split dump pipe and exforce figh flow cat into a 3.5" exhaust and didnt lose any power there. can feel the gain and turbo spooled much quicked.

id go Just jap. great guys to deal with and quailty product without the price tag.