I purchased a NOS TPI Nitrous Plate and was wondering if anyone knew the dimensions of the openings? I'm going to place it behind my 52mm ASM Throttle Body and wanted to know the difference between the two...

"It'll be fine."

Will it work, yes I'm sure it will. I'd prefer if the bores on the Throttle Body matched the bores NOS TPI Nitrous Plate. I am going to port match the plenum to the NOS TPI Nitrous Plate but it seems counterintuitive to slap on a Throttle Body with smaller bores.

From the information that I gathered on this and other forums the openings on the NOS TPI Nitrous Plate are 58mm, therefore a 58mm Throttle Body is in order...

NOS TPI Nitrous Plate layed over a AS&M 52mm Throttle Body

Disappointed that the bores don't line up perfectly , a little more concerned that the bolt holes don't seem to match up either...

Break out the drill (and/or) drill press.

The holes line up, just pic angle makes it look funky

I don't see the holes on the spray bar is that backwards by any chance?

They both point to the middle of the plate so the fuel and NOS will mix better.

Your overthinking it, unless your engine needs a 58mm tb. What you are saying is similar to having a single square butterfly on a carb so it will cover the intake manifold perfectly. Dont need it.
Slap it on there and enjoy hauling the mail.

NOS TPI Plate layed over a TPIS 58MM Throttle Body

Any thoughts on the misaligned bolt holes?

See which one fits ok on the plenum.

I just was working on installing my NOS tpi plate today and im noticing that my plate is a slightly different shape on the edes. my bolt holes lined up exactly, but I did not take a rear facing phto as posted above..

ALSO **** my plate came with engraved lettering on the one side stating "THIS SIDE TO MANIFOLD" AND*** the blue nozzle fitting is on the TOP and the red fitting on the bottom

exactly like this photo:
https://eb9239d2b3c1bda1d53d-6b4eb89...m/05151nos.jpg

or zoom in on the plate on this one.. https://www.holley.com/products/nitr...parts/05151NOS

that's what I have. the only thing about it I didn't like.. was the gaskets were a little oversized, so I'll just slightly shave/cut them down when I'm done with the install

*** Is my plate setup an updated version... or should I be worried that my plate IS different than the photos posted above ???

IROCZman15 - Thanks you for input! Indeed, you have an updated design, that is why your Nitrous plate & Throttle Body mate up perfectly. Mine is an older design, hence my problems

Did you already bolt it all together?

You shouldn't have any issues, it only goes on 1 way. Have you tried to put all the bolts through all the parts yet?

TTOP350- Do you have a part number for the plate in question?

If you ment the 4.6, no I don't. I took it down after i looked at yours again. You have the correct part.
Have you tried to put the bolts through everything?

I sent the plenum to TPIS for porting (52mm to 58mm) it's scheduled to be shipped out today. I'll bolt everything together and snap some photos.

Does anyone have any information as to why Nitrous Oxide Systems updated the plate design?

Probably changed suppliers or just wanted to freshen the design. Maybe they made a small change to something and this helps them identify the change.

sorry I took so long to upload photos, busy time of the year.

however, here are the photos of what seems to be NOS's updated plate design. the one that came with my setup and is now installed on the car










don't worry, this winter I am going to buy a planned out assortment of -an fittings and probably run some of the feed lines differently. possibly under the plenum

IROCZman15: Looks Good!