There is nothing you can do to make your streetmate go faster other than gears unless you install an airsal kit which is what I did. Once you change to the kit then and only then can you use other a35 performance parts. The a55 has a different bend in the exhaust pipe so the normal pipes will NOT fit. Ike and I cut and fit a tecnagas next pipe onto a stock a55 with a 24 tooth gear and it did not run any better than the stock pipe.