Which are best for performance?

I've got equal length ScoobySport ones at the minute, but i'm missing my 'burble' so guna swap them to unequal tubular/ported ones... I wont be, however, if its going to be detremental (spelling!) to performance.

Cheers, Mark

 

Unequal are still good for up to 400bhp I believe. And also, you're better off with polished and ported OEM ones, such as those sold off the shelf by harvey. PM/email him with your full engine spec, and he'll advise and also advise on the most appropriate ported uppipe for your spec, so as to retain max spool too...

Fitting tubular ones, if below c.400bhp, can be detrimental to bhp gains/spool-up and a could actually be a "backward step".

 

You'll save a few bob too.