The 165 lbs would include the box and packing. So maybe the Banks Power pack weighs around 150 lbs. Then you didn't include the rest of the old system in you weight comparison. Count all the old stuff you are taking off, including the nuts, bolts, "Y" pipe, resonator, intermediate pipe, muffler, tail pipe, 4 clamps, 2 manifold to "Y" pipe gaskets, etc. I suggest it's a wash in weight. Those long tube headers are heavy.
You probably have a rear axle weight issue. If any weight is added, it will probably be on the front axle. I too have to watch my weight closely.
And while I'm on a roll (or rant), clean the exhaust ports with a wet stone and some mineral spirits. No gaskets required. Banks uses a 5/8" header flange. The left frame shield goes on after the left header.
Make sure and use all the included heat shields, or you pay the price later.
Off soap box
Richard
95 Bounder 32H F53
Banks Power Pack
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