I want to add a bit more power and sound on my evo without going to crazy. My car is completely BONE STOCK. I do have a boost gauge but that's it. Can I reflash a stock evo to get more power or do I need mods first? I'm planning on getting just a catback for now, mbc, either drop in filter or open filter, and maybe a upgraded bov. If I get the open filter I will get a reflash so I don't loose power. I'm really just wanting my car to run 22lbs. all the way to redline with no boost taper. Evo's are sooo quite that I want a bit more grunt coming out of my exhaust too. What is the best route for me to go? I do not want a downpipe so that's not even an option right now. I want simple mods I can take out and swap for the stock parts if she has to go to the dealer. I don't want to be swapping downpipes all the time. I'm looking to put myself to the 300hp mark for now.

 

You can get good power from a flash with or without mods, but it won't really add sound.

You wont' run 22psi to redline without taper - the turbo just doesn't work that way, so don't expect to do so just because you get an MBC. It will spike to 22psi, hold 20-21psi for a while, then drop to maybe 19psi at 7k or beyond. I don't recommend 22psi without a full exhaust, because the DP and cat cause a lot of backpressure.

You can do a downpipe/testpipe and still return to stock easily by dropping the whole exhaust as one piece then reinstalling the whole stock exhaust. That's as easy if not easier than removing the MBC and re-installing the stock boost system. Plus, they won't care much about the downpipe anyway - it's the cat they don't want you to touch mainly. You'll need a full exhaust for 300whp - basically everything in my WT package, so look at my sig link to see the parts you'll need to get (package or not, you still need that combo of parts).

 

Yes you can reflash your stock car and gain about 20WHP.

I think its gonna be hard to make the evo hold 22psi to redline. 22PSI peak and 19-20 psi redline sounds resonable.

You'll notice a big difference in sound with a catback + open filter

 

Well I don't have access to a lift all the time so the exhaust would be a PITA to swap out. Currently my car spikes to 21psi and tapers to 19psi at redline so what's the big difference? Can I run an open filter w/ a reflash safely? I was told not to use an open filter unless you have a reflash. Do I also need a bov to raise the boost or will the stock one hold 22 psi? I was toldby my dealer that a catback is fine but turboback is iffy....

 

You definately don't need a lift to do an exhaust. The evo is very simple to swap the exhuast.

If the 05's came with the cheap plastic BOV like my 03 did (similar to 2g DSM bov) then I'd replace it for sure. If it's the MR JDM type metal ones (similar to 1g dsm bov) then I'd say you're good with the stock.

I'd do a turbo-back exhaust, boost controller, intake, fuel pump, mbc, and bov and then get the reflash. If you're worried about returning it to stock for a dealership trip, it would be a simple matter of only a few hours (at most) to get the car back to stock condition with those minimal mods.

If you're looking for someone to do the installs, PM me, I'm relatively local to you.

 

Open filter is fine with a flash, but it's not necessary, will draw unwanted attention from the dealer (an intake is far more likely to void a warranty than a downpipe), and it will make a lot of noise.

You don't really run 21psi tapering to 19psi - you just think you do. If you logged your boost with a MAP sensor, you'd see it doesn't spike as high as you think and that it tapers a LOT MORE than 19psi. People always think their boost is higher than it really is when trying to watch a boost gauge at full boost and full speed on the highway in higher gears - not really that reliable (your eyes nor the gauge itself).

Your stock BOV leaks as early as 13psi, so you can run 22psi on it, but it won't be very efficient. Get the JDM MR DV at least...

 

Well I've never had a problem with my car so far (knock on wood). But i'm there once every 3000 miles for my oil changes. I'm just worried they will get pissed when they see it.

 

3000 is too often unless your Evo is in extreme conditions (lots of racing) or unless you're not using synthetic oil. Just FYI...

 

change mine every 3K - mostly highway, daily driving...but i do notice some slight mpg dropping by the time the 3K comes...is it all in my head?!

 

Yes, because synthetic just starts doing its job around 2k. Before 2k, it's not fully working yet.

 

whats everyone's take on the vishnu reflash they offer(stage 1)

 

i change my oil every 3k.....with mobile one synthetic. I was told to do that when i first bought my evo from the service guy who had a 10 second talon. Since i get free oil changes from mitsu i have nothing to lose.

 

Get a reflash and test pipe..Works great and adds a hint of sound to the exhaust..Those mods will put you in the 12's easy..BTW I am selling a UR 2.5 inch test pipe..

 

I changed the oil in my Talon every 3k miles religously with Mobil One synthetic. That thing just kept running and running and at 95,000 when I sold it the compression was near perfect and I beat on that car but took care of it at the same time. 3000 is my dealer says to do also. I don't believe in that 5000 mile crap. It not a volkswagon it's a high performance sports car. Anything more than 3000 on a turbocharged car is just asking for it. Thanks for all the input guys. I might be considering a downpipe but a fuel pump is out of the question. Thanks!

 

Why is a fuel pump out of the question? You won't get worse gas mileage as a result. My worst gas mileage was experienced when the car was bone stock. When I added a full 3" exhaust with no cat I gained around 20% fuel economy and monitored absolutely no loss when I installed the fuel pump months later. The fuel pump takes probably 30 min to change at the most.

I'm with Warr on the oil change as well. I don't change it on either of my turbo cars before 5K and if it goes to 7K, then who cares. Then again, if I tracked the car heavily, I'd adjust this quite a bit.