Mark Craig said:j. m. mcfly,
We sell tons of our aluminized and SS off road cat test pipes. Too loud is a relative term, what you think is loud the next guy thinks is just right! The 5 inch is making it worse than a 4 inch will, but it also depends on the muffler a lot of the 5 inch mufflers are totally hollow and set up a real loud booming sound, check yours to see what it has or not, that might be all you need is a real packed muffler and a test pipe. Call us if you have any questions etc.
Mark @ DPPI