Anyone here do this,and how much did it help you. Watch a neat video at Benzworld. Start with a dremel stone,to sand paper working to 240 grit,and then scotch bright.Then Metal polish,you only touch the area where throttle plate rest,with metal polish

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1999 w140, quit voting to old, and to old to fight, a god damned veteran

Much ado about nothing. You aren't gaining anything unless you increase the flow all the way through the system. What good will it do to have a 300 CFM flow through the intake if you only have a 275 CFM flow out the exhaust? (made up numbers for comparative purposes ONLY!)

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now

Right Mike D,I figured if you ported and polished the head,then it would be better.I can't find headers for mine,so I removed cats,and got rid of mufflers,and use a single Borla race muffler.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran

Honestly I'd be surprised if you could measure a 1CFM difference at the rate these engine flow air at.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

Maybe you should consider going forced induction or buying a faster car, you're sort of grasping at straws here over basically no power increases.

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68 280SL - 70 280SL - 70 300SEL 3.5 - 72 350SL - 72 280SEL 4.5 - 72 220 - 72 220D - 73 450SL - 84 230GE - 87 200TD - 90 190E 2.0 - 03 G500

Nissan GTR - Nissan Skyline GTS25T - Toyota GTFour - Rover Mini - Toyota Land Cruiser HJ60 - Cadillac Eldorado - BMW E30 - BMW 135i

Throttle bodies and MAF housings actually like to have some roughness to let the air tumble.
It may look fancy to polish it, but it won't help.

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Nathan
'74 280C - gone to a new home for the finishing it deserves.
'64 356SC
'74 914 2.0

thank you all for explanation

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1999 w140, quit voting to old, and to old to fight, a god damned veteran