So Im taking my car to a shop to get my clutch replaced and they asked if I would like to up grade my exhaust and change my cats to high flow units or weld in test pipes cuz they have to remove it. I can't really afford to get a couple of high flow cats right now so Im wondering if the test pipes will work fine? ( A bit chepper ) Or should I just wait and get the high flow ones in a later date. I have a cat back already from Borla. Thanx