09-09-20, 02:04 PM
Replied by PM yesterday. 
Here's what I wrote in case anyone else is wondering:
You can enlarge the second hole but it makes very little difference to performance and tends to make the mixture a little too rich at part throttle. Also, it's more difficult to get at the rear hole, so overall it is easier and just as effective to enlarge only the middle hole.The Slip-On kit has 122.5 main jets, the MB kit (used for Full Monty) has 127.5 mains and a different needle profile. The MB kit is designed to flow more fuel to work with less restrictive full system exhausts. However, with the appropriate mods to the inlet rubbers and airbox lid, it works very well with the stock headers and a less restrictive end can.Hope this helps. Mike
Here's what I wrote in case anyone else is wondering:
You can enlarge the second hole but it makes very little difference to performance and tends to make the mixture a little too rich at part throttle. Also, it's more difficult to get at the rear hole, so overall it is easier and just as effective to enlarge only the middle hole.The Slip-On kit has 122.5 main jets, the MB kit (used for Full Monty) has 127.5 mains and a different needle profile. The MB kit is designed to flow more fuel to work with less restrictive full system exhausts. However, with the appropriate mods to the inlet rubbers and airbox lid, it works very well with the stock headers and a less restrictive end can.Hope this helps. Mike