They sell lead additive for OLD cars... anything before about 1970 in it's ORIGINAL form would be designed to run leaded gas... you can convert most engines to run on UNLEADED but using hardened valve seats and stuff.. but it you wanna "keep it real" you'd need that additive... now, weather it's actulay LEAD or a synthetic that ACTS like lead, I dunno.. it's basicaly there as a lubricant for engine components...
as for the exhaust grumble and poping... that's normal liek the other posts said... generaly its caused by oxygen getting into the exhaust system and re-igniting your exhaust...it's more previlant if you have bad exhaust leaks... if you are nice and sealed up you'll still get it cause of your air pump I guess.. though I kinda like that sound... but that's just me
-as
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'89 GT Convertible:
TFS TW Heads, TFS Street Intake, TFS Stage 1 Cam, FMS 1.6 RRs, 24# Injectors, Pro-M 75mm MAF, No Name CAI, 3.73s, O/R H-Pipe, FlowMasters, AOD w/ Trans-Go Shift Kit
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