M8 stage kits
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Stage I
Joined: Aug 2023
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From: Alabama
M8 stage kits
Kinda new to the stage 1-4. My question is if I get the stage 2 done, later on I want the stage 4. Do the dealership just add what need be added to make it a stage 4 or all new parts? I know it's a dumb or.crazy question. Thanks in advance
Seasoned HDF Member
Joined: Jan 2008
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From: State of Confusion
Harley's website explains how all their Screaming Eagle stuff works .. very informative and educational for their performance upgrades .. would be the best place for you to start investigating
HDF Community Team
Joined: Oct 2018
Posts: 4,347
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From: Seattle
Stage 1: Exhaust and Intake.
Stage 2: Cam upgrade, sometimes manifold.
Stage 3: Bigger Cylinders and Pistons.
Stage 4: Head work and related modifications.
Stage 2 with a bolt in cam, to stage 4 will probably include swapping to a cam that requires higher than stock lift springs, and a large intake manifold.
So from standard bolt in stage 2 to stage 4 you will probably need a new cam, heads, 64mm manifold, cylinders, pistons, performance lifters, and many other new parts.
Road Warrior
Joined: Nov 2018
Posts: 1,277
Likes: 1,018
From: Eastern Ont.
HD does it like this
Stage 1: Exhaust and Intake.
Stage 2: Cam upgrade, sometimes manifold.
Stage 3: Bigger Cylinders and Pistons.
Stage 4: Head work and related modifications.
Stage 2 with a bolt in cam, to stage 4 will probably include swapping to a cam that requires higher than stock lift springs, and a large intake manifold.
So from standard bolt in stage 2 to stage 4 you will probably need a new cam, heads, 64mm manifold, cylinders, pistons, performance lifters, and many other new parts.
Stage 1: Exhaust and Intake.
Stage 2: Cam upgrade, sometimes manifold.
Stage 3: Bigger Cylinders and Pistons.
Stage 4: Head work and related modifications.
Stage 2 with a bolt in cam, to stage 4 will probably include swapping to a cam that requires higher than stock lift springs, and a large intake manifold.
So from standard bolt in stage 2 to stage 4 you will probably need a new cam, heads, 64mm manifold, cylinders, pistons, performance lifters, and many other new parts.
and different tunes on Stages 1 thru 4
Road Warrior
Joined: Oct 2009
Posts: 1,664
Likes: 99
From: P.E.I. Canada
If you know youre going to do upgrades later, you can start gearing yourself towards that now. Some cams have lots of room to grow when it comes to displacement. Also, maybe you only get slipons now, and you can do a head pipe later. Any decent breather should work for both. Then you need to think about what tuner you will use.
If you plan on keeping warranty, some of those decisions will be made for you
If you plan on keeping warranty, some of those decisions will be made for you
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