not to mention the RSR is probably the loudest of the main brands, with the Blitz nur spec a close second...
as already mentioned, backpressure doesn't exist, it's velocity and the scavenging effects of it...
The downpipe, and really more importantly the elbow are the worst restrictions (especially if the first cat on the DP is clogged), and will see the best gains IMHO.
The reason for the question about if you're on the stock HG is that these mods will up the boost and quickly take out a stock HG...
as already mentioned, backpressure doesn't exist, it's velocity and the scavenging effects of it...
The downpipe, and really more importantly the elbow are the worst restrictions (especially if the first cat on the DP is clogged), and will see the best gains IMHO.
The reason for the question about if you're on the stock HG is that these mods will up the boost and quickly take out a stock HG...