I just sold my Z and I had these test pipes left over. These were a noticeable gain over stock exhaust. with cats. New they were $175-
Email me at greg.j.anderson@gmail.com if you are interested
Here is the Description from Z1 his exhaust section resides between the downpipe and cat- back section of the exhaust tract. It eliminates the stock catalytic converters to enhance exhaust gas flow and provide the least possible resistance. This translates into better spoolup of the turbos and more power realized from not choking the engine''s exhaust stroke. We typically see increases in power of ~17RWHP and even more torque.
We recommend these 2.4" dia pipes for applications up to 400 hp as we have seen only small gains in going to 2.5" testpipes at the 400 hp level..
Follow Ups
Z1 Test Pipes 2.4" for Twin Turbo- Asking $95 obo - Mr.AndersonTT01:47:05 01/30/10