EPROM Chips

[WhyTwo]

I've taken the decat pipes off my Mk1 Tuscan and put the cats back in - sounds better with CCC's. Do I need to stick the original EPROM chip back in or can I continue to run it with the replacement chip put in with the decat pipes? On the 40 miles since putting the cats back in it's running fine but I know the EPROM is set up for the car to run specifically with the decats

Also the MOT is due soon and I don't want it to fail on emissions so any advice very welcome

[Delboy1]

Your best off speaking with Dom at TVR power. He will be able to give you the quickest answer

[WhyTwo]

Spoke to Martin at Racing Green and he said i's probably best to go back to the original chip as the later chip is set up specifically for the decats. I'll whip it out and swap it later