Info on Blow off valves, uppipes, blow off plates, & more -Neon SRT-4!

So you own a 2003-2005 Dodge SRT-4 and want to know more about adding an aftermarket blow off valve to your car. Or perhaps you just want a simple bolt on replacement for your stock diverter valve to make more noise! Either way we have lots of information here to help you.

To begin- the turbocharger on the Neon SRT4 spins very fast. Say you are driving along, and have to hit the brakes, so you release the gas, and hit the brakes. The turbocharger does not stop spinning, it continues to spin, and compress air. So all of this compressed air is going towards the engine and throttle body but the engine is not ingesting the compressed air. This is where the stock diverter valve comes in. When you release the gas, the stock diverter valve will open, and release the compressed air thats not needed from the turbo.

Now, this stock diverter valve is designed to handle up to about high teens, or probably a max of low 20's psi of boost. If you start to get near that amount, the stock diverter valve can be pushed open, and boost pressure can leak by. This causes a loss of horsepower.

Furthermore, the stock diverter valve is very quiet. Thats no fun!

So, we have a few options for you:
-Blow off plates - these are $50-80 spacers with holes cut in them so that when your OEM diverter opens, you hear a noise. These are very simple pieces, and do not change the boost pressure tolerances of the OEM diverter. These just make noise. These are quite noticeable, and make a WHOOSH noise every time you release the gas to shift, or come to a stop.

-Upgraded OEM type diverter valves- like the TurboXS SML - these are factory replacements that have higher tolerances for higher boost. These should be able to handle up in the high 20's boost pressure wise. These are not as loud as the Noiseplates listed above, and are far quieter than the real aftermarket blow off valves listed below.

- Aftermarket blow off valves like HKS, Greddy, Turboxs, etc. These are very high quality, handle very high boost pressures (up into the 20's and 30's psi wise) and are made with tight tolerances. These will not leak, they handle high pressures, and sound fantastic. When you are installing one of these you will need a mounting pipe (uppipe) that goes between the intercooler and the intake manifold for the blow off valve to mount to. Also, when you are installing an aftermarket blow off valve, you do not need the factory diverter valve so you need to get a block off plate to seal off the mounting location of the OEM diverter.

Another advantage of using a aftermarket blow off valve with new uppipe, is that uppipes like the AGP uppipe have a threaded air intake temp sensor. The OEM pipe has a plug in type sensor that frequently blows out and causes a vacuum leak. The AGP uses a OEM type intake temp sensor that is threaded, and will not come loose, or pop out. So if you get a aftermarket blow off valve and AGP uppipe, you'll get a great sound, precision made blow off valve that wont leak, and a uppipe that wont have a leaking air temp sensor that blows out. Winning, Winning and Winning!