Sounds to me like you have a vaccum leak causeing your car to run lean thus making the exhaust hotter then normal. The only reason I know this is because I did the hg on my 86.5 and got one of the VSV brakets caught in the intake manifold and it was doing the same thing yours is but my exhaust manifodl was glowing. That plug is probably not your problem when you crank it up then have someone listen for a hissing under the hood around your intake manifold I have a funny feeling it has a leak.
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1987 supra NA 5 speed
1JZGTE swap
Tokico Illumina 2 and Eibach springs
Tokico pillow blocks
Suspension Techniques front and rear sway bar
HKS super dragger cat-back exhaust plus test pipe
Greddy Profec B spec 2 boost controller
HKS type 1 turbo timer
Supra sport solid steel drive shaft
Walboro 255 fuel pump
JZA70 Front end mod
18" Volk Racing AV3 18x8.5 front 18x9.5 rear
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