Forced Induction Supertech performance valves for $280.

Supertech performance valves for $280.

I believe these are the same valves MWR offers, but for less. I've bought my TOGA oil pump from this company and they were very fast shipping.

http://www.importperformanceparts.net/imports/supertvalves-toyota.html

Supertech Performance Valves
- High Flow Rates
- Less Friction
- More Power
- Featuring Black Nitrided Treatment!

Supertech Extreme Flow Performance Valves for Pro Street and Racing are engineered for High RPM and High HP. Extreme Flow Valves outperform any other valve on the market today, and with their Nitride Coating are perfect for High Temperatures (and run cooler which improves value life), Nitrous, Turbos and Superchargers. For naturally aspirated motors these valves will give you a much greater cylinder flow for good HP gains.

Manufacturing/Description
Intake and Exhaust Valves are One Piece Forged, High Temperature, High Nickel, Stainless Steel Alloy. Valves are CNC finished to strict tolerances making these valves the choice for the most demanding race classes.

Black Nitride (Coating)
The micro-hardness is higher than the stainless steel base material, keeping good ductility beneath the hard nitrided layer (micro-hardness is 800HV minimum). Surface finish is smoother than with chromed stems, having less friction between stem and guide. ---
Valve seat surface is harder with the nitrided layer, lasting longer with lead free fuels, alcohols, nitro or other "explosive" mixes. Matches any kind of seats (nodular iron seats, steel powder metal seats, hard aluminum-copper seats or beryllium copper seats). ---
The higher the engine speed the bigger the power loss due to internal engine friction! The black nitride layer reduces this power loss due to less valve-guide friction.
The nitrided layer is adhered to the base material at a microscopic level, so does not "flake" or brake when the valves bend due to impacts with the pistons. ---
The Black Nitride applies to the whole valve while the chrome coating is only applied to the stem. All valves are swirl polished, have stem undercut and a hardened tip

Chrome (special coating used only as noted)
Widely used and known in high performance valves Only applied to stem.

Inconel (special valve material used only as noted)
Inconel 751/Nimonic - These Nickel based alloy materials are used for Exhaust valves in engines that reach very high temperatures and its use is growing with the application of turbos and superchargers.

exactly how will these give any gains if they arent oversized?

The stems are undercut and back cut to allow more flow around them into the head. Also, you can't just oversize them and assume that means they'll flow better. I've heard that sometimes oversizing them can cause air turbulence that takes away from HP unless the rest of the head is worked on to properly account for that. I dunno if that issue is limited to NA applications or not. These are also stainless steel, so they're stronger and will hold up better with my turbo setup since I completely fried a few of my valves.

what kind of horsepower gains are you looking at?

As much HP as I can get out of 450cc injectors with the fuel pressure bumped up a little more. The engine should be able to handle over 20 psi. First things first though. I need to get the engine up and running. Once I've financially recovered a bit from the upgrade, I'm looking into getting low resistance injectors and a resistor pack so I can run bigger injectors without having a crappy idle. I might upgrade from the eManage Blue to the Ultimate as well (I want to keep OBD2 for emissions, so no stand-alone for me).

Well, I'm hoping to make a little more than 300 and I want to be on the safe side. I'll most likely be selling my 450cc injectors if anyone's interested, for $250 plus shipping.

I had 450's in mine but then dialed em back to stock cause the ruff idle pissed me off

That's weird. What brand did you have? I have a perfect idle with my custom green Bosch injectors.