Stillen Fix'em up?

1slow370 · 02-03-2010, 04:40 AM

Anybody else have plans to turn their Stillen headers into longtubes or is the general consensus just to sell them and go F.I.? I paid 450 for mine and with the price of metal I'm pretty sure I can have them modified for 2-300 with welding done at a shop, then maybe send them out for some JETHOT ceramic (best there is) and try to get the whole thing done for 750 uncoated, 950 coated.

Modshack · 02-03-2010, 09:59 AM

Just adding pipe does not a long-tube make. F.I.'s appear to be a well engineered system that went through several versions to arrive at the final product and get the results they have.

Hacking up a set of short tubes may result in less power then you have now..
That's a definite SKIP..

1slow370 · 02-03-2010, 02:22 PM

I'm not just welding in some tubes. The primary diameter is about right but the length on the stillen headers is crap. the headers are currently 17" long, and according to a bit of header tuning for where i wan't to move the torque curve that length is going to be stretched out to right around 30" to get my midrange back. I'm going to be stretching the collector length out at least 2 inches if i can help it as well to further enhance the low end without going far enough to kill the top end. I know the bends are more exaggerated than the F.I. but i don't expect them to make as much power either. I'm trying to make the Injen cold air intake of the header market. It won't work as well but at least it will work.

m4a1mustang · 02-03-2010, 02:39 PM

Quote:

Originally Posted by 1slow370

I'm not just welding in some tubes. The primary diameter is about right but the length on the stillen headers is crap. the headers are currently 17" long, and according to a bit of header tuning for where i wan't to move the torque curve that length is going to be stretched out to right around 30" to get my midrange back. I'm going to be stretching the collector length out at least 2 inches if i can help it as well to further enhance the low end without going far enough to kill the top end. I know the bends are more exaggerated than the F.I. but i don't expect them to make as much power either. I'm trying to make the Injen cold air intake of the header market. It won't work as well but at least it will work.

That's very random. You either need to go short-tube and connect to cats, HFCs, or test pipes or go LT and by-pass the cat section all together.

There's no place for a mid-tube header. You'd have to get rid of the cats so why not just do it right and buy a purpose built and tested LT setup.

1slow370 · 02-04-2010, 04:19 AM

30 inches is the length that tunes the headers to shift the torque where i want it and it will end up putting the collector somewhere near the middle of what would be the cat so after the collector you just bend up a piece of 2.5" tubing and weld it to the collector and place the cat flange where it would normally be. Tuned length headers are not meant to just start and stop wherever there conveniently is a flange. I know many of you may not know this but you can make your own parts, thats how we do it for all the cars that don't have an aftermarket like this one, and this isn't my first rodeo in making headers.

02-03-2010, 04:40 AM	#1 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	Stillen Fix'em up? Anybody else have plans to turn their Stillen headers into longtubes or is the general consensus just to sell them and go F.I.? I paid 450 for mine and with the price of metal I'm pretty sure I can have them modified for 2-300 with welding done at a shop, then maybe send them out for some JETHOT ceramic (best there is) and try to get the whole thing done for 750 uncoated, 950 coated.

02-03-2010, 09:59 AM	#2 (permalink)
Modshack A True Z Fanatic Join Date: Mar 2009 Location: Greenville NC Posts: 2,883 Drives: 370Z Sport Rep Power: 976	Just adding pipe does not a long-tube make. F.I.'s appear to be a well engineered system that went through several versions to arrive at the final product and get the results they have. Hacking up a set of short tubes may result in less power then you have now.. That's a definite SKIP.. __________________ Steal my car! (SOLD)...Now Porsche Cayman S Oil Cooler DIY: Here!

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02-03-2010, 02:22 PM	#3 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	I'm not just welding in some tubes. The primary diameter is about right but the length on the stillen headers is crap. the headers are currently 17" long, and according to a bit of header tuning for where i wan't to move the torque curve that length is going to be stretched out to right around 30" to get my midrange back. I'm going to be stretching the collector length out at least 2 inches if i can help it as well to further enhance the low end without going far enough to kill the top end. I know the bends are more exaggerated than the F.I. but i don't expect them to make as much power either. I'm trying to make the Injen cold air intake of the header market. It won't work as well but at least it will work.

02-04-2010, 04:19 AM	#5 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	30 inches is the length that tunes the headers to shift the torque where i want it and it will end up putting the collector somewhere near the middle of what would be the cat so after the collector you just bend up a piece of 2.5" tubing and weld it to the collector and place the cat flange where it would normally be. Tuned length headers are not meant to just start and stop wherever there conveniently is a flange. I know many of you may not know this but you can make your own parts, thats how we do it for all the cars that don't have an aftermarket like this one, and this isn't my first rodeo in making headers.