help educate me about exhausts...

[rock]

considering getting "freeflow" exhaust....

what do I need to know before I go into the exhaust shop ?
do I get my cat convertor removed ?
will it make any real difference in performance ?
what about petrol consumption?

...and what does a free flow have or dont have that a standard exhaust has/hasn't got ?

 

[rock]

little advice anyone ?

 

[thedoc]

I would imagine free-flowing exhaust'swill have less bends, or at least smoother bends than in the OEM & usually a bigger bore. But bore size - too big & you loose back pressure & too small you restrict the engine = both not good for perfomance.