Generally you want 4" of total lift for 33s. With the flat fenders you might be ok-ish for the front...but the back might need to be limited with a lot of bump stop.
What are you trying to accomplish or a you just going for a look?
One of the questions I see so commonly asked in the Jeep Wrangler TJ community relates to people who are new to the Wrangler TJ and have questions about what kind of lift they need, what the best lift is, what tires they can run with each lift, etc.
I'm going to try and sum it all up in one thread so that any of the new owners have a resource to help guide them in their path to building their Wrangler the way they want it.
First and foremost, in order to determine what kind of lift you want, you need to ask yourself a few questions:
NOBODY knows what you're using your Jeep for. The only thing that matters is "what do YOU think of a 2" lift with 33s and BushCracker flat flares?" It's your Jeep, don't ask other people their opinions unless you like negative comments. Flat flares are an illusion of more clearance. Having 4" of lift with 33s doesn't make any difference for mud, maybe for rocks. There is no given setup that is a must for everyone's needs. Here's a 2" lift with 31s and flat flares. You would have 1" less tire/flare clearance with 33s.
When I bought mine it had a 3" lift and 33s and cleared everything just fine, no contact. But only barely. Any less lift would've had me into the flares and/or fenders. Ran 35s on 3"+1.25" for a while but had a fair amount of contact.
Depends on how you're going to use it. Daily driver for me often on mild unmaintained access roads to dispersed camping locations and outer beach soft sand. No rock crawling.
I have 2.5" SL.. no BL.
33x12.5's on 15x8.5
BW flat flares.
Zero issues.
I run 33s with a ~2.5" lift and Rubicon flares and have for a long time. They can rub, particularly in the back when the flex is pushed, but they serve me well in the way I usually use the Jeep. Usage similar to @MikekiM minus the beaches and the commuting. I can confidently drive to any trailhead in the Colorado mountains, but know my limits in rock crawling.