I have an 02 that has the original exhaust. I am wondering what is the most economical aftermarket exhaust I can install without having to remap fuel system and lightens the bike up. I see lots of what looks like chinease stuff on ebay, but wonder if any of it actually works.

Thanks for any help

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Most any light weight aftermarket muffler is going to be a straight through design which will require re-mapping the fuel to run right. There are a few threads somewhere on this forum where a single exhaust system was fabricated and the owner said the bike ran fine without re-mapping the fuel and also resulted in a significant weight reduction.....I'm assuming your bike is a 1000.

Yes, mine is the 1000.

Dan Moto and others have a number of very affordable slip-ons. You can see the weights of the various models. They are light. If you use the baffle (sold separately) it is likely you will not need to do any remapping.

I checked the Dan Moto site, and they only list 2014-2019 DL 1000’s

I may be the exception to the rule here, but I have a 2006 DL1000 which is currently running Two Brothers exhaust and a Pipercross high-flow air filter, and I haven't done any kind of fueling mods, i.e., Power Commander V or Fuel Controller. However, I got the exhaust used, and the pipes came with optional tips added into the ends, kind of like these , and have some spark arresters I can put in if necessary, so maybe those took care of the need for fuel remapping? Not totally sure. I was a bit nervous about putting all that on, but I wanted to try saving some weight up high, not really caring about making extra hp or noise (though they definitely are louder), so I decided to try it. So far it's been running fine.
Maybe someone else can chime in here, would it be because I also run premium gas instead of regular? That's the only grade I can get here without ethanol.

What are you hoping to accomplish with an exhaust change? Aftermarket cans will save weight, but anything with a near-street-legal loudness probably won't flow much more (or make much more power) than the OEM cans. If they do substantially increase flow, you'll almost certainly need a FI box of some sort, as the '02 runs an open-loop FI system which can not compensate for flow changes without external help. From what I've seen, the Vee is at least as power-limited by the airbox/air filter/intake and cams as by the exhaust. And the secondary throttle plates intentionally limit power in certain circumstances anyway, along with the timing retard.

So aftermarket exhaust benefits mostly come down to weight and sound, rather than power.

Personally I like quiet motorcycles. And with my oversized butt in the seat, 20 lbs. saved on the exhaust isn't going to help much.

I haven't seen any complete aftermarket exhaust replacements which would provide a more radical weight savings, with a large withdrawel from your wallet as well. Some DIY'ers cut and weld to make it a 2-into-1 exhaust, saving some weight, but possibly increasing restriction.

I can't say for sure but - I think the TL1000 has the same diameter pipes.

Suzuki TL 1000 R/S All Models JISU Black [EX-00419b] - $286.20 : Danmoto, Motorcycle Racing Parts & Accessories
Their web site says:"the total weight of the complete set is less than 4Kg."
They are in Reno.