For a carb'ed application, they most definitely do work. They keep the carb from cooking off and make a small change in low end torque. For a EFI, they will keep the intake a little bit cooler and thats about all the good they will do for a long runner EFI intake. You should also bypass the intake EGR spacer coolant line if you're gonna bother to do this. No sense insulating the intake below if your heating it at the top. The slightly lower intake temp will make slightly cooler and slightly denser air enter the motor. Worth a hp or two. I'd do it if you can make one fit.
I ripped out that insulatiing pad the first thing when I got the car. Rip it out and go phelonic. Dont get a cowl hood, every idiot in a jetta will try and race you and every cop will be drooling to give you a ticket.
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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