Does Berk have a 70mm? All I could find was a 63.5mm...

 

Berk FTW. Best 63mm TP out there. Built-in CEL fix and really nice welds. Other TP's have had issues with their welds cracking over time, but not the Berk.

 

ust get a berk if you want something standard. T1r testpipe has tabs for heatshield mounting if you want to be sneeky. I have a t1r but I took it off because I noticed my exhaust tips turning yellow from the sulfur.

 

What benefit do you get (if any) from a test pipe with two drilled holes? I know one is for the oxygen sensor, but what is the other used for when it isn't plugged?

 

Science of speed has a testpipe with two holes, One is for the o2 sensor and the other an extra o2 sensor on dynos I believe to tune cars.....thats what their site says at least.

 

Wide-band O2 sensor.