Gransport231
Member
Hands down headers are the best thing you can do to let these engines breathe, but if you are not going all out performance or need to save some cash like I did ZZP now offers a front tubular Exhaust manifold to replace the stock cast iron piece. There are no performance #s up yet, but I am sure it will flow quite better than the stock cast iron piece. I got ported and polished exhaust manifolds, but if I had this option a few years back I probably would have got this instead. Here is a link http://www.zzperformance.com/grand_prix/products1.php?id=208