Fast 911 Turbo

Finishing up this 997TT race exhaust with Gesi cats and dual 3” tips.
Www.markskituning.com
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Happy Holidays from the Markski Tuning Family.

Did a tune and an exhaust for a client, but he kept saying something doesn’t add up, the shop said everything was done right, even did a boost leak test,
I finally got a Durametric over to him, and whah do you know :
Bank 1 pre cat o2 is dead ( most likely when the exhaust was being switched).
I always say, some sell tunes and a few tune. There is a difference. This could have gone dramatically wrong being at 1 lambda on boost.