<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: padgett</div><div class="ubbcode-body">A '90 has the "C" 3800 and the exhaust is not the only limiter - small valves, small throttle body, mild cam, restrictive exhaust manifold - the package is really designed for low speed operation and optomised for the 55 mph national speed limit. The '91 "L" engine has a lot more of everything and quite a bit of potential for tweaking but not the "C". </div></div> so i should swap in manifolds and exhaust from a 91 riv?