Is SLP the best Headders for my car...I have an 89GTA with a 350tpi, No Current Mods...yet. What Size tubes would be optimum. I'm also thinking of going with AFR 195cc Heads in the Future so I need some headers that will be compatible with those also.

 

SLP's are good for your engine (1 3/4), but are expensive. Check the archives for more info on this topic.

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92 Camaro RS, LO3, 5-spd, T-tops

Performance:
K&N Open Air Filter, Edelbrock performer TBI intake, Fastchip Prom, Timing +4 degrees, Centerforce clutch, Xact 8mm wires, SLP 1 3/4" Headers (coated), Flowmaster Catback Exhaust, Z28 Grille w/aftmkt fog lamps, MacEwen white-face guages
Electronics:
Alpine 8030 Alarm System, Valentine One Radar Detector (How did I ever drive without one?), Pioneer DEH 7450 Head Unit w/6-pack CD changer, Pioneer DEQ 7600 Sound Processor, 2 Kenwood KAC-846 Amps powering 2 12" Pro Red subs, 2 Pioneer 6x9 and 2 MTX 4x6 speakers.
NEXT UP: TBI mods, 3.42 gears w/Torsen posi

 

If you have the money get the SLP's, I couldn't quite afford the over $400 at the time and got the Edelbrock, when I first put them on my 305 I definately noticed a power and sound gain. The good thing about the SLP's is they come coated, my TES headers are now rusty looking.

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'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER, NO CAT
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
2:73 GEARS
Rebuilt 700R4, with manual valve body
B&M Megashifter, 5" Autometer Tach w/shift lite
Soon to be installed
3:73 Richmond Gears and 3" Hooker Aero Chamber
Corvette Servo & .500 boost valve
15.61@ 95.2mph G-Teched, 1-2 shift slippage
"There is nothing more addicting than speed"

 

so I should get the 1 3/4 tube headers...hugh.... are those too big for a 350? or just right?

 

I know a guy running 1 5/8 on a 383 that will revt o 7k

1 3/4 is probably a bit big for a STOCK engine

depends on if you're after torque or HP
1 3/4 for carb
1 5/8 for TPI

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1985 IROC-Z
TPI 305, 700R4 with shift kit, richmond 3.73's, auburn pro series posi, crane compucam 2030, ported plenum, gutted air boxes, all the little insignificant stuff.

 

My friend has a 89 Iroc-Z with 1 3/4 and was VERY happy with them. 14.2 @ 98mph with a 2.1X 60 ft. 2.0 60ft and hes hitting 14 flat. That was awhile ago though, he had free mods at the time. Now he has chip and removed smog and hits 14.0, with a decent 60ft again he is all 13's with an exhaust, not to shabby with 2.77 gears. He knows lots of **** though, if i had his knowledge i wouldnt have hit a 14.4 after my header installation, stupid 5spd 2.16 60fts, they are no good in 1st gear!

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1990 G92 5spd LB9 - 3.42 80,000 miles

Accel Ignition/Wires (8.8mm), Advanced Timing, TB Bypass, Ported and Gasket Matched Plenum, Synthetic Motor Oil, 160 Thermo, TPIS Airfoil, K&N Air Filters, Centerforce I Pressure Plate and Clutch, Edelbrock TES Headers, Dual Cats, Edelbrock RPM Series Catback, Homemade Ram Air, Bosch +4 Platinum Plugs

14.4 @ 94mph w/2.0622 60ft (w/o headers and catback)

14.426 @ 96.19mph w/2.167 60ft(w/headers and catback)

 

Yes, go with the SLP 1 3/4's if u can.

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89 RS

STILL Looking For:
87 IROC-Z28 350 TPI