My evos got a 3inch air intake, 3 inch down pipe with open wastegate dump and a custom exhaust with catalytic converter deleted and dual mufflers. My afr at wot is around 13.1-13.6 Im burning pretty rich I believe and im almost certain this isnt good for the car on factory tune bought the car this way I have extended warranty through a 3rd party company but fear voiding it for a tune whats a safe afr for the evo and should I get a tune to be safe and just void my warranty its good till 2020. Sorry if im in the wrong forum dont really post anything.

 

I am going to assume you don't have a tune? or do have a tune? I can't tell by your description and warranty concerns.

13:1 under full load is actually lean and IMO not safe to drive.
Full load you should be ~11.2-11.5 at peak torque (generally a good safe zone) and can taper towards and into the 12's by redline if you're maxing out your tune.

 

Yes I do not have a tune and thats my concern since the afr is not were it should be. Im just not sure if a tune is probably best thing to do or not as warrantys voided then. I unfortunately dont have the orginal exhaust and down pipe since the other owner sold that. I dont plan on modding it more than where it is at though so would the evo still be really reliable with lets say a performance tune and economy tune? Id probably get the access port from cobb then take it to the tuner.

 

Without stock parts stock tune is not likely your best direction.
Wouldn't your aftermarket parts void the warranty any how?

At this point, personally, I would get the car tuned by a reputable tuner, no need for COBB, just a waste of money for someone who knows how to tune Evos. If you'd like, you can keep the tune conservative and no extreme boost levels or timing.

This scenario would be your best direction not buying stock parts and having a safe tune, on the plus side you'll pick up some pretty ponies in power.