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Why do these pipes look different than all the other test pipes? It does look like a y-pipe, but I checked out the site you linked. I think these pipes might be for another car, not the Z. I could be wrong.

Besides, I thought I read a really bad review on Xerd. Hopupracing has Helix test pipes for $169. I've heard good things about them.

However, some people seem to dislike the 'raspy' sound of the Helix pipes at a certain rpm range. I think for a couple of seconds, I can ignore that sound for the power gain.
 

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I would stay away from regular test pipes period. Have heard that they are extremely raspy. Better to go with resonated test pipes.
 
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