UEL HEADER W/o tune
 

Hey guys quick question about UEL header.

So I'm currently boosted with @WORKS stage 2 carb turbo which is tuned using our stock EL headers. But I'm considering that subie rumble. Obviously switching out headers looses carb approval. The main problem is I like how the tune is working so would swapping from an EL to UEL WITHOUT re-tuning give me the rumble and not throw a CEL/compromise my current tune(how the car is currently running?

I've searched a bit but none of the other car mentioned have a stage 2 turbo

it will probably run a little off if you don't get it tuned for the UEL. I wouldn't risk running it long term without a re-tune specifically for the UEL. it might sound better to you with the rumble, but it probably isn't running optimally and might damage something in the long run. it will also probably turn on the CEL since the turbo kit was meant for the stock headers which mean the O2 sensors/cats were not deleted and are still present.

Definitly talk to works and your tuner.


the P0420 cel code is an insignificant issue


changing to a catless or high flow cat header with turbo will effect how the turbo spools/makes boost, this may significantly effect the tune required.


It may make boost a lot quicker and the original tune may not suit resulting in significant knock or other issues.

If you're losing carb then there's no reason to keep what looks like a laggy as fuck turbo.

Actually the turbo spool extremely quick putting down the throttle and the car just pulls hard. It can be felt almost right away which is why I want to keep it. The reason for the question is if I do need a smog check in the future I could just quickly put back the stock header to pass smoke without again a re re tune

I feel like youd do more damage putting a ulh on a catted tune rather than a cat on a ulh tune. i wouldnt run the cat with a ulh tune but it should be fine for just the smog test

Mate... what the hell is "ulh"? Tipo for uel?

UEL HEADER W/o tune
 

Unequal length header I believe since we're on the header topic

unequal length header

You can fail smog in CA on a visual check of non-OEM headers not containing a CARB sticker.

The AVCS timings will be for an EL, and on a UEL it will both run poorly and sound poorly.

All around this is not a good plan; you will not be CARB legal and you will not get what you want out of the UEL header.

Thanks for restating what I said about avoiding carb legal and thanks for the AVCS timing info.

I'll most likely keep my header since I don't want to have to redo the tuning