First I must quality this. I have not been involved with anything "DOHC" is ages, and even then it was stock. And I spend all my Xweb time on the X1/9 section so I'm not current on what has already been discussed here. So apologies if this question is non relevant or redundant. I know Fiat once did a boosted version of the Spider, but I'm not referring to that. And I'm sure others have at some point built a turbo'ed 124 or other DOHC engines, but I'm not familiar with them. So I'm wondering about the practicalities of doing a mild turbo DOHC? I'm not talking high boost (maybe less than 10 PSI), nor a race/track performance application. But more along the lines of what a factory might do. Conservative, low boost, with lots of safety built in. That would require electronic fuel injection with a aftermarket ECU that controls fuel, spark, boost, etc., as well as cooling system upgrades, etc., etc.. The basic concept is not to build a monster, but to make a more "livable" and "enjoyable" power plant (ie. a bit more power yet still very streetable). And yes, the twin cam can be built to all sorts of levels without going to boost. But that is not what I'm interested in here. Thank you for not going down that road. Is this something that has been pursued? And if so, how did it go? Could this be considered with a stock engine (without custom pistons, rods, crank, valves, etc)? And I ask that last question specific to the DOHC components, not to boosted engines in general. In other words, I'm familiar with the limitations/pitfalls of going turbo, but not with these engines specifically. I've been developing the same idea for the SOHC engine and appreciate any input on this concept potentially applied to the twin cam engine.