We all do it. I will shortly be convincing myself that it was a good idea to splurge £460 on an exhaust. Hopefully if it doesn't go any better I'll think of some other reasons why it was a good idea. One of my favourites is people who buy big valve hot cam 1641 engines for their vans and convince themselves that 70HP (at 5,000rpm) demonstrates unarguably what a great choice was made, even though it must be a dog in a bus and a PITA to drive. Personal favourite, and you'll mostly disagree I expect, is alloy wheels on an old bread van. Yes the wheels are sexy, yes the van is kool, but have you really looked at them together with an open mind?