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400whp club here I come!!
HT MR2 Turbo
Joined
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3,546 Posts
I'd say it's better to control. Nice to have something to call back on if your boost controller takes a shit. Otherwise... say bye to your engine. It's pretty simple to build one... takes about 15 minutes.
 

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I love Cin
91 Turbo MR2
Joined
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2,312 Posts
If you want to run over 17 psi of boost, you have no choice.
You have to get rid of Fuel Cut.

If you plan on staying at 17.5 psi or less, then getting the HKS FCD will offer you protection in case of overboost.

I knew since day one that I would be going beyond 17 psi ... so Isaved my $99 on the FCD.
 
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