stascom

Namely, intake, high-flow cats, and a tune. It's the kit from Z1. Would run me $1200 or so. Would I even see a 15whp gain?

A-Town-Z

iTrader: (4)

It's expensive to get gains NA out of our motors. That's just what it is. IF you have a shop install the parts for you, it'll be even more expensive..

That being said.. I have all you have mentioned and more on my Z and it really changes the car. Is it worth it? Yes and no.

I enjoyed putting in the work and it sounds much different and is more enjoyable to me. Some people wont have the same feelings.

Personally if you want to go the route you are posting about here, i'd get a good free flowing exhaust too. This will help maximize your gains.

travlee

iTrader: (8)

i started at 269 and ended at 286 whp

iideadeyeii

iTrader: (6)

No, it really isn't.

MicVelo

Interestingly, while the gains on either a DE or HR are minimal, NUMBERS WISE, the differences can be felt. 20WHP does make a difference. NOTHING like going FI or full bolt-ons + cams; but a tune truly does help put the power down and depending on how it's tuned, said power comes on nicely at mid-to-higher rev range. Honestly though, on the street, one may only truly feel it under WOT, say, getting on a freeway; but if you track, 20WHP can make the competitive time difference.

Worth $1200? Only one person can make that judgement call. Personally, $1200 for even 10WHP is cheap. $120 per pony.

bealljk

iTrader: (13)

I would do it ... one of the most documented gains on either engine is a re-tune. If you can modify the intake and exhaust and get tuned it'll be a step in the right direction. If you were only going to do the intake and the HFCs w/o a tune I'd say not worth it...

travlee

iTrader: (8)

how is getting the $1200 figure, good intakes and a tune will eat most of that

my break down to get 17 whp

takeda intakes $388
Art pipes $600
TDX2 - $1600
Tune - $700 (retune - $400)

bealljk

iTrader: (13)

Trav - doesn't sound like there is an exhaust involved...looks like it's this setup:

https://www.z1motorsports.com/z1-pow...el-p-4276.html

travlee

iTrader: (8)

so he is doing half the work.... to each their own.

stascom

Not quite. We're in the HR forum, so it's this one
https://www.z1motorsports.com/z1-pow...el-p-7012.html


The reason I don't want to do the exhaust is because I've deleted the muffler. Swapping stock cat for HFC should get pretty good flow, IMO. I can't imagine there would be any significant restrictions for the stock volumes of combustion.

travlee

iTrader: (8)

its still a single exhaust though..... why not do a true dual?

stascom

The value is terrible. I have K&N intake with missing heat shields. Instead of screwing around with fabbing replacements or attempting to order every single piece to construct a replacement from K&N, I figured I would just ditch it for a better one (Z1). While there, I saw the HFCs and thought, "eh, what the hell..." So the CAI is getting replaced regardless. There is no debate on HFCs having a substantial effect (and they're cheap). And I can justify the tune, if the gains are there (per OP). But spending $1500 on exhaust that would be, IMHO, marginally better is wasteful to me, especially since I'm very happy with its current sound.

ashram

iTrader: (1)

I think it's worth it , with uprev tune , art pipes and Invidia Gemini exhaust my 5at made 280 whp. I definitely noticed the difference. Test pipes will give you the most gains, I recommend art pipes .

iideadeyeii

iTrader: (6)

I'd assume it's going to change when you change out the cats. The stock 350z without a muffler actually sounds pretty good. Not sure with HFC and no muffler

travlee

iTrader: (8)

stascom

Yeah, I'm a bit concerned about getting the rice rasp. But I'll deal with that when I get there.

bealljk

iTrader: (13)

I ran high flow cats with a stillen true dual and it was sorta raspy in most RPM ranges ... the benefit was that at high RPMs (I thought) the sounds was amazing!

BluestreamDE

Brah, is that Tomei?

Surfer90291

On the HR the biggest gains would be high flow cats or test pipes. The intake is already well designed but the Injen is a good alternative. 3" single exhaust would be the better choice.
You could also swap the whole HR upper and lower plenum with the VHR, it's better flowing and keeps making power to 7400 rpm (HR plenum falls short at 6400 rpm), very easy mod.
With these you should be able to get close to 300whp after tuning.

stascom

So the stock 370Z intake plenum just bolts on? I suppose the classifieds on 370z forum would be the place to check for sales.