The problem isn't really with the quad shocks- it is the tailpipes... Lots of guys drop the quads completely when they get beefier upper and lower control arms.
I put 26 x 10 ET Drags on with the quad shocks flipped but my tailpipes hit hard- hence why I am looking for quieter mufflers that do not require tailpipes.
From what I have read- 275/40/17 is about the max you can run with 17 x 9 cobra r rims with flipped quads, tailpipes, and some inner fender clearance.
On 16 x 7 pony rims you really should run 235/50/16s as the max. I run 245/50/16s but as the rim is so narrow compared to the tire I doubt I am getting the proper footprint. They don't look weird but you should really only go one size above the 225 factory tires. When I bought my car the previous owner had mounted 265/60/16 tires, and while they somehow cleared, traction and handling was ridiculous. Just changing to my new tires made a huge difference in daily driver handling/traction. Down the road I may get some of those wider mavromont 17" pony rims for that factory sleeper look.