amen to that. too many hacks make way too much of a mess of things. great for me , I get to fix them, bad for the customer as they still shop on price and know no different.
one that really spring to mind are the dealer fitted and manufacturer fitted (locally) alarms. the brant (nee subaru now) items I can find and remove in about 3-4 minutes due to the way they are done. they stop some people but not all. same goes with these cars (V35.) reason that you may have ended up with a key (for unlock) and a remote is they simply did not understand the car. these cars run one module that controls the ENTIRE car. fry it and it gets VERY expensive very quickly. some of the jobs I have seen from shops with ADR alarms shock me. (see below.)
click this:
look at the 350Z and the R33. both are shops.
http://www.audioexpress.com.au/shop/HOS/
(still not finished with the pages so its a bit buggy )