I'm not sure where you heard those reports, but I didn't find any complaints about SLP springs sagging. Some after running for a few years. The most common complaint is minimal drop. Eibach pro-kit is another story, but these aren't the same spring.

And good luck finding OEM bumpstops without paying an arm and a leg.

 

Really? They are all over LS1Tech...

Start here (hint it's not *just* about the Pro-Kit version), and use the search:
Whats Your Take On Eibach Pro Kit Springs? - LS1TECH

I recently bought OEM bumpstops, and it depends how important ride quality is to you...

 

All the reviews seem quite mixed from what I found, to each his own I guess. Even if I have any issues with them I'm not too concerned because the rears seem to be the only problem. And those are quite easy to change.

But the SLP springs does answer the OP's question about an aftermarket spring with minimal drop. It's up to him whether he sticks with stock or goes with something else. Even stock springs with sag sometime, my fronts were low from the day I bought the car at nine years old and 95k miles and for who knows how long before then. I just didn't realize how high they should have been.

I just want to help the OP to be able make the best educated decision on what to do with his ride.

 

^ 95k is low miles for OEM springs -- unlikely to be sagging -- if they were sagging, you surely needed shocks too... That said, V6 springs are less firm than V8 springs (front only in 98-02 AFAIK)...

 

Yeah, those old things are long gone now.

I wonder where the OP went?

 

I have a 1994 Mustang v6. There is a knock or bump sound from the front passenger side when turning right. Does anyone have any idea what could be making that sound? It doesn't make the sound when turning left.

Thanks,
J