Small Port and OBX Tri-Y Header

[Nativo]

Hello Guys;
Has anyone with a Small Port installed an OBX Tri-Y headers????? If so has it being dynoed?? Would love to see the graph, where did it gave power where did it lose power???

Also any Smort Port with Tomei Pon Cams and the OBX Tri-Y headers???

[Army Fork]

Never dyno'd, but I have installed them on a silvertop before and we've had some serious fitment issues (OBX is being an absolute tool about it, refused to reply to any of my emails and that's the only way I can get ahold of them) in that the downpipe just barely meets the headers IF you remove the first heat shield on the SR5, never tried it on the GTS but apparently it lacks this heat shield. Even so the downpipe will not fit unless you use the lower Cusco mounts, and I can't guarantee it will work then. You will have to send it to a exhaust shop to get an extension welded on which won't cost much but is definitely not a bolt-in like OBX claims.

You have been warned.

[gotzoom?]

It fits fine on my car. I have a 20V blacktop with Cusco mounts. It does state that it only fits with manual steering racks, so I assume that to mean you'll hve fitment problems if you have a ps rack. I have never tried to size it up with a ps rack.

[Army Fork]

OBX doesn't state that it requires the use of a manual rack on their website, thankfully I did a full manual conversion before because I wanted to drop some weight and get better steering feel. There's no way that the power rack would not have interfered with it judging from my build.

If you can get ahold of the Cusco mounts and you're running a power rack it should fit without issue, the actual headers themselves look pretty good under the hood. Welds are decent and although the internal construction isn't top-tier, for the price you can't do better and it should give you a slight power boost.

[colingchambers93]

i have the oldschool obxheader with power steering and all and it fits fine

[Army Fork]

I haven't heard any complaints about the standard header, guess that's why.

[Duy-]

even with cusco mounts i had a lot of issues getting them to fit, had to get an exhaust shop to do it. i own 2 tri y headers and 1 of them did fit better than the other lol.. currently this is the situation (pic below)
other than fitment that looks like it was designed for an engine stand and nothing else... the headers make incredible torque and even mid to top power. after all the trouble, im definitely glad i have 2

[Army Fork]

The polish on yours is certainly better than mine, which I plan to sort after the build is done. OBX did not do their homework with this, I am glad however that you noticed a difference, I'm looking forward to hearing mine once I've fixed my ST's valve tick

[Duy-]

how bad is the valve tick? 20v with open stacks are really loud... you can hear the entire valve train and then you get the common vvt click which makes it sounds like your knocking top end. but im rubbing against the frame rail btw.. the vibration is pretty annoying

[Army Fork]

Just tore it apart and the problem was not a valve, turns out piston 4 (nearest the bell housing) is hitting the head and has done some very minor damage, could be fixable with a die grind. Seems the problem is probably from a combination of the TRD head gasket and a recent decking the head and block received, currently debating whether or not to modify the head or to run the stock head gasket I currently have sitting in a box.

Another possibility besides a slightly taller #4 piston is a spun big end bearing, but I sincerely doubt that's the problem. Nonetheless I'm draining the bottom end and pulling it to ensure that's not the issue

[Army Fork]

To keep this a little on topic, generally the Poncams will give you a 14-15 horsepower boost and you should expect a few extra ponies from the new header, not sure how much but I'd guess around 17 or more extra ponies, maybe a few more. The biggest thing though is that the poncams give you a better power curve with more consistency through the rev range, plus they don't drop off in power like the stock cams.

[yoshimitsuspeed]

http://matrixgarage.com/products/tomei- ... 64-81mm-ex

I can repair and modify SS exhaust systems if anyone wanted to get one of these to fit their car better.
If you take it to most muffler shops they will use mild steel and or bad welding techniques that will cause your nice stainless system to start rusting where it was modified.

[Army Fork]

Which is why you should select your shop carefully before you bring in your car

[Duy-]

so I had a chance to test fit it onto a 16v, hits the distributor quite a bit, it's a lot worse if you're using a smallport distributor. I would highly recommend getting it custom fitted as mentioned above instead of trying to force it in