Come on pred, theres plenty of new jap exausts(think titanium as well) being made for the 32, and the gtr cat backs are fine to use as well if you want an even wider range perhaps. The only thing that really limits you is the effort you go to getting the parts and the money you spend.
Grab a trust power extreme II if you like that look, (personal taste is whats important too!!!) and want a jap brand. Its quiet and loud if you know what i mean. That 2.06lt chic has one on her high hp gtr too so its probably not as restictive as some loacal manufactures would lead you to belive.
On another note, i bought a combined dump/front pipe from batmbl; does he have the twin ones in mild steel avaiable yet for HCR32?? or any skylines?? I am very keen to get one when he does. Otherwise i too think i will grab a CES one for around $500, preferably not ceramic coated.
As far as power/responce increases go i think it depends on application. If you were running high boost and high rpm the turbulence/backpressure increase/whatever in the exaust is going to be much higher/worse than in a sub 1bar stock turbo car. Thus the increases in performance less noticeable when putting a CES twin dump on the stockish car than the modded one.
Apart from that the other gain is relevant to the stock car and the modded one. Apparently with the split design and decent lenght ie 400mm of wastegate gas separation you gain RESPONCE.
This is not something i have discovered (yet)but what SK will tell you only a whole lot better than i can. I am currently tho about to(when i get a spare day) raise my boost to around 17-18 pound through my blended dump/font pipe. In the next few months i will change over to a twin design from CES and let you know how it feels, if it boost earlier, if it has better responce etc.
I bought the BATMBL blended one in the first place soley to see for myself the difference when i chage to a CES/decent dump/front pipe. The costs were not the issue and nor was the fact the HKS dump pipe is the biggest heap of crap ive ever seen. Its one case they sure did manage to make shit shine tho
I dont think the dyno is going to show many gains on this one (though it might thru the midrange) unless you car is having trouble with boost consistency(from turbulence/backpressue/whatever though the top of the rev range and it is directly attributed to the dump pipe. ie not the turbo size or boost controler
Then there is the question of the standard exaust manifold and what increases(or decreases, lol) i could get from chaging that to aftermaket HPI/HKS style (see greeline.com). There is a guy selling one for 600, Bargain!!
Thats a whole other story tho,
Mick