bolt-on cat-back? only one i can think of that's easily available is the JIC Bullet, but i think it's discontinued now. Wald, JP, and a couple other super high end JDM companies make them for the VIP scene but going rate on those is ~$2500 and up for a cat-back (rear section mufflers alone are ~$1000-1500).
generally your best bet is to get it made locally.
1. Black on Black 1999 LS400 PM-spec
-Maya-Megan-Magnaflow-LSportline-Xenondepot-PPE Engineering-Duce-Platinum VIP-Figs Engineering-R1Concepts-
2. Black 2001 MR2 Spyder -#muchroadster-
3. Black 2004 IS300 -Manaray-HKS-Eibach-Kumho-
4. Ebony Teal 1995 LS400 11-8-06
We used to joke that only performance cars did the cooling down tinking exhaust sound. Most of my cars have done this after a long or particularly hard run. I've never associated it with a problem as it's happened on different cars from different manufactures on both old and new ones.
Very true, I can remember as a kid whenever my family used to pull into the garage in the summertime and we closed the garage door behind us and there was total silence you could here small pinging noises coming from the car. It did not matter which car we used. I think it all depends on how enclosed the space is around the car and how quite the ambient noise is. I would assume that it would be hard to hear these noises if the car was parked outside.
I thought I just had a small leak in my 1997 ls's system... Turned out to be that the Y pipe was rotted, one manifold was cracked, and the egr tube was rotted. $80 for a used manifold on ebay, and a local custom exhaust shop took care of the Y pipe for me. It was going to be $175 for them to make me a Y pipe, but I ended up having them run dual pipes from the cats to the factory mufflers, and it only cost $150, AND their work has a lifetime warranty.