Join Date: Nov 2011
Location: Ontario, Canada
I believe that the second set of plates are about 6 inches behind the first, but if you have already drilled out the first set, you should be able to see the second set and measure yourself with a dowel or broomstick. The corrugated cat material is just behind this, so don't drill too far just yet.
Take it in stages and see if you like it. Going further is up to you.
The decel popping has actually always been there and doesn't hurt your engine. With the plates drilled, it just means that the mufflers are not "muffling" it anymore...you just didn't hear it before when the mufflers were undrilled.
You don't have to get a fuel manager or reflash, but many do just to add a little more fuel to prevent the popping. The general rule is that you don't really "need" a fuel manager unless you are changing BOTH the exhaust AND intake, in order to prevent a serious lean condition. Several 1700 owners drilled out the complete muffler without a fuel manager and have not damaged their engines.
Note: Based on what I have read on this forum, the Ivan's ECU reflash definitely seems the way to go and you would not need a dyno run to get it mapped later!...so it could actually work out to be cheaper than a Power Commander V and a few hours of dyno time.
I had a Bully/EJK which helped with the popping and improved performance, but it took a lot of fiddling to find the right settings. However, for a little more, you could get the ECU reflash and greatly improved performance across the board (true plug-and-play!).
So, save your money! Do a little exhaust drilling in stages. Then get the performance mod that makes the most difference...the ECU reflash.
Last edited by Vulcan Hammer; 08-23-2016 at 09:19 AM.