official_style

well im about to pull the trigger on LT headers. i can either get 1 5/8 " or 1 3/4" i am not planning on doing a blower, eventually heads and cams and thats it. i am thinking the 1 5/8" headers, the others will be too big and ill lose power. what do ya'll think?

Torrence

JBA longtubes, can't go wrong.

atomic_il

1-5/8 all the way!!!!!!!!!

official_style

i am getting american racing longtubes. i have seen them in person, and they are without a doubt the BEST headers for this car. NO fitment issues. these things blow away ANY headers out now. i guess the 1 3/4" are for blown stangs. http://www.americanracingheaders.com...ng_System.html

don_w

I'd say stick with the 1-5/8 for a NA motor...

official_style

ya thats what im gonna do.

futuresvt

What about a car that is N/A at present but hopes to be blown in the future?

Is there a drawback to 1 3/4 tubes on an N/A 4.6 3V? If so, what?

officespace56

I have read that you lose a little torque with 1 3/4 while N/A, but it will not be that noticable. If you are for sure going with the blower in the near future, I would give 1 3/4 a shot.

futuresvt

I'm nowhere near "for sure" on a blower, but it is definately on my want to do list.

My concern is, if I plan ahead to take advantage of bigger tubes for a possible blower, will it hamper my car while N/A either until I get a blower or in the event i don't get a blower?

tom281

I would still do the 1.75" primaries, even if you're gonna be NA for a while.

Kooks and American Racing make great headers, but boy....$$$$$. Many people have had good luck with JBA and some forum members here have had good luck with OBX, which are stainless and sell for ~$500.

JonCo

I'm running 1 3/4" L/Ts right now. I didn't notice a loss in performance. Been this way a few months now. Of course I have a blower on the way. Either way I think you'll be happy.

SlamMan02

Im running 1 5/8 because thats what BBK sells but regardless Ive heard most people should usually just stick to 1 5/8 because no real power advantages are shown until upwards of 600rwhp

70MACH1OWNER

+1 ^

bob

I'd say 375hp and down 1-5/8, 376hp and up 1-3/4

SlamMan02

based on what?

TillmanSpeed

1 5/8" Kooks or American Racing.... that's all I'd put on my own car. From a custom tuning perspective, you'll have fun letting any other brand header's upstream o2's warm up.

futuresvt

I'm understanding your post to mean the only brands were Kooks or ARH. I am pretty much limited to ARH because I want an H-pipe rumble and want to stay street legal at the moment. I also understand they are high quality.

I don't know what you mean by this, could you explain?

Also, why 1 5/8?

No one seems to have answered my question. One reply notes there is no real power advantage to 1 3/4 until >600 hp, but does installing 1 3/4 cause a problem if N/A??

What is the problem with 1 3/4 on an NA motor, or is there no problem? If no problem, why does everyone sell and install 1 5/8 on N/A motors?

I'm assuming it may also open up the exhaust sounds a bit, which would be a nice bonus, but hopefully without the x-pipe raspiness.

officespace56

JBA also carried catted H-pipes to go along with their longtubes, which is what I have. The headers are top notch quality.

And NO. There is no problem with running 1 3/4 primaries on an N/A car.

SlamMan02

Only downside to the 1 3/4 when running NA is you will probably lose a little power down low from a loss of backpressure- but I would guess its very minimal...There is not enough exhaust flow to justify the bigger piping from that of the 1 5/8

n8rfastback

ive got bbk's and i love them....

again they are the 1 5/8"
i plan to get blown some day and im not going to upgrade to 1 3/4 when i do....