I had fender exit headers built with merge collectors. He sent me pictures of it and they stick out about 2.5" at the short side and 4" on the long side. I was wanting to trim them back some but he says can't trim merge collectors without hurting the performance of the headers. Is this true or can they be trimmed a couple inches without hurting them? I may just go to a standard collector if I can't trim them. I haven't seen it in person and it may look fine once I see it in person just want to be ready with ideas if I don't like it.