hey GoldDigger, if you cant hear now do you think the sidepipes will fix the noise problem with 4inch pipes???;56 You can put sidepipes on a RHD vett if you want! get some headers made up to join the 4-1 outer section! or a cheaper way is to get some 4-1 headers then adapt the single pipe to go back into 4 smaller pipes or into just 2 (of the 4) pipes.