How safe would it be to run a GReddy Ti-C full 80 mm TBE without a tune? The guy that is going to sell me his exhaust says he ran fine without one. Thoughts?

I was thinking since the engine runs rich on the stock tune and the exhaust does not replace the 02 housing that I could get away with it without an issue since my car is otherwise stock minus a drop in filter.

Also, is there a way to fix the CEL that would result from installing this exhaust?

You will be fine for a while. Get a Wide Band asap tho to monitor A/F. Yes evos run rich 2011 i hear not so much rich. What year is yours?? To be safe tho you should get it tuned sooner than later esp if you have a down pipe. Buddy of mine has a stock DP but a full 3'' Exhaust and test pipe. No Probs what so ever. Not even a check engine light. But yes in theory you be ok. just get wide band to watch....... GL

^^^^ 2008 i gotcha.. my bad

My DEPO Testpipe has a 2 In CEL ELIMINATOR. works flawlessly . if yours doest have that at all you can buy them and take it to muffler shop and have them weld it for 20 bux.... Piece o cake

Why wouldn't you just get a tune. The gains you'll see will be minimal, and your money would much better invested in a tune, even with no mods.

I can't seem to grasp why people mod their cars with no tune.

Only reason is he is selling the tbe, a NIB Grimmspeed 3 port boost solenoid, and an upper intercooler pipe for very cheap. Its a deal i cant pass up and I don't have money for both the parts and tune. Frankly I'd love to have a better sounding car so I think the exhaust is a good idea, especially this deal i am getting.

And I know I could tune without buying these parts, but wouldnt that require a retune? I dont have the money to keep tuning every time I choose to add another part so it makes sense for me to get the parts first and then tune.

I have the Greddy ti-c turboback exhaust and had it on for months on the stock tune, no problems. I waited for more mods till i get tuned( currently a work in progress ) i have a 2011. If you have any other questions feel free to p.m me

I would just recommend installing the UICP, and Cat-back, hold on the DP till before you're ready for a tune. That way you can enjoy the sound, and not worry about how your car is running.

Yes I have several friends with Evo Xs running without a tune but have the parts(you mentioned) already installed so its fine. When you install the exhaust be sure to also install a CEL mechanical fix. Its a spacer for the 02 sensor on the midpipe. This will tend to keep the CEL off longer than running it without one.

This CEL fix spacer thing, is that a separate part that is welded on to the mid pipe? Should I get one that is a straight piece or is the elbow version better?

Thanks for all the input guys!

You won't have a problem w/o tune. Just make sure you get a test pipe similar to ours that has the o2 spacer/J-bung o2 to pull the secondary sensor out of stream. This will make sure you don't set off any crazy check engine lights and go into limp mode.

ETS Michael here to save the day again! Only problem I see is the GReddy tbe is a two piece and the dp is a dp/midpipe combo. So if I purchase an ETS test pipe I would need to purchase another downpipe as well or use the stock downpipe? Idk if that's the right path, not that I dont love ETS products, but I cant afford the get another downpipe and testpipe AND this deal.

Basically the guy is offering me the GReddy full 80 mm turboback exhaust, a brand new in box Grimmspeed 3 port, and an upper IC pipe, for $400.

So could I get away with just running the tbe without an O2 fix? Honestly I would love a different setup but this makes A LOT of sense for me financially. Once I have the money I could always sell the exhaust and get a sweet ETS setup

What are your thoughts Michael?

You could always purchase a screw in j-bung from vibrant that hooks into an existing o2 sensor bung.



If you do decide to sell the exhaust, we would be more then happy to help you

They also have this one with adjustable gas flow to make sure you get no CEL