Happy New Year! To start off the year why don't we do a looping fight similar to Stephen Vyas' looping animations Eg. http://gfycat.com/EverlastingLinearAtlanticsharpnosepuffer Maybe spend a couple of weeks on this? Or suggest another idea that we could do?
Swiftloop lets you edit ANY pre-created loop. Hold Ctrl+Click while in Swift Loop to select a loop. Then hold Alt+Click while in Swift Loop to move that edge along a constraint or Ctrl+Shift+Click to remove the edge and all verts. No undoing necessary.
I'd re-route geometry, either welding vertices or deleting edges in order to preserve your existing topology by utilizing the wheel arch control loop due to the intersecting curved surfaces and high subd level guide mesh.
Like Pior said - take the time to read that thread. It's huge, yes, but it's invaluable. Although keeping quads is very important, there are times were Ngons are perfectly fine. The main problem you have in that example scizz, is that your edge loops are incomplete. You were doing just fine, but it looks like you stopped…
I dont know if you were using edge loops initially, and I dont even know if this will work now its tris. But arent edge loops dependant on angles? So it should still see the edge original loops. So (still some work involved) if you select a edge from each of your edge loops, then hit the loop tool. Hide these then do the…