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Old 11-13-2015, 01:39 PM   #11
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Better off with a K&N Filter Charger.
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Old 11-13-2015, 04:59 PM   #12
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[QUOTE=TWP723;355223]Better off with a K&N Filter Charger.[/QUOTE

I do realize that, having had K&N filters in all my vehicles for the last 20 years.

If I knew of a way to get around the stringent smog laws here in the land of fruits and nuts, I would do the system.
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Old 11-13-2015, 05:32 PM   #13
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I have been tuning GM fuel injected cars and trucks for over 10 years and I can tell you that the spacers make negligible difference - I tried one on the dyno one night just for giggles on a relatively stock Camaro. The concept of increasing the intake manifold volume behind the throttle body causing an increase in torque is correct, but the volume increase that spacer makes isn't enough to make a difference. If you look at the design difference in intakes, the truck intakes make more torque than the cars because of the volume difference and runner length difference - but the car intakes make more upper RPM horsepower.

It is also true (to some extent) that you have to tune the computer to see ALL of the gains of modifications like cold air kits and exhaust mods - you will get some of the gains without tuning. Big modifications like cams/heads/superchargers/turbos all require extensive computer tuning.

As for tuning, be careful with the handhelds - if you don't know what you are doing, you can hurt your engine. I can vouch for Blackbear tuning - he knows what he is doing.

And, so you can see that I know what I'm talking about - attached is a pic of my street driven Trans Am (now sold) that regularly ran mid-9's at the track - built it and tuned it myself
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Old 11-24-2015, 03:37 PM   #14
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GC is right, majority of bolt-ons will only add a small amount of horsepower and you'll need a sensitive butt to tell the difference. Most of the performance gains are found in the bottom line of companies such as K&N and not in your vehicle. You will get a small mpg gain out of an intake and exhaust but you'd have to drive the wheels off it to get a payback. The stock ECM can handle the changes from exhaust and intake without a tuner. I've tuned a number of GM's and I use HPTuners, plugin units with canned tunes are a waste of money on a gasser.
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Old 11-25-2015, 09:10 AM   #15
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If the spacers really worked to improve mileage don't you think the manufactures would put them on at the factory to improve corporate fuel numbers??!!
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Old 11-25-2015, 09:25 AM   #16
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If the spacers really worked to improve mileage don't you think the manufactures would put them on at the factory to improve corporate fuel numbers??!!
Can this not be said for virtually any aftermarket improvement? It seems like since fuel prices went up and even before then, people have been looking for another mpg. And the Feds have been pretty aggressive with fuel economy standards. Seems like if there were an aftermarket part or process ou there that could make a difference, it would only be a matter of time before the OEMs find a way to make it work on production vehicles.
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Old 11-25-2015, 09:30 AM   #17
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If the spacers really worked to improve mileage don't you think the manufactures would put them on at the factory to improve corporate fuel numbers??!!
Point!

Set and Match.
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