It is very unlikely that a car, that can drive 70mph, will have any idle problems caused by a bad cat.

We have installed many aftermarket cats and DEC does a decent job compared to others. I will say that there is no chance that I would place an aftermarket cat on a 1996 car or newer.

The main reason aftermarket cats cost significantly less is because they ARE significantly less. For the great bulk of auto owners a pipe to the rear is all they want and the aftermarket cat does a good job here.

With OBDII starting in 96 the car now will observe the efficiency of the cat (can you say post cat O2 sensor) and those aftermarket ones are lucky to keep the "check engine" light out for six months.

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician