i got a set of headers from tropic i think they are obx-r i put them on and everything is cool but i can't get the downpipe to seal it has a small gap and i bolted it as far as it would go the gasket wont fit (stock) can i dremmel it out im getting ready to put some high temp sealer on it to see if that works.any suggestions please help. my car sounds like it has a turbo on it it is whisling and running rich due 2 loss of backpressure.