Is there any advantages of having one over the other?

 

bolt ons you can install in you garage with minimal tools

weld on are more solid and rigid. after time bolt holes can elongate due to movement and allow more movement. welded sfc prevent this from happening and stiffen the car more, and stay that way over time. weld ons are typically cheaper, however you have to (most people) pay to have them installled.

call around shops, i had mine welded on very cheap cause i had a hook up, but typically $100 is a good price, as long as you do the prep work yourself. you'll have to clean off any undercoating and dirt, and probably grind off some of the paint/powdercoat from the sfc to get a goood weld. that way the shop just has to hold them up and weld.

i have alot of install and final product shots on page 3 of my webpage in the sig.

 

Another vote for weld ons.

 

go with the weld in's well worth the money, i had both night & day difference.

 

Welded SFC's are the only way to go. What do you think is more solid, a bolted or welded connection????

 

You'd have to be making some pretty massive HP to stretch tubular steel, or even the bolt holes. Welds can break, bolts can be replaced much more easily.

 

i'll have to disagree with that

 

it's not something that happens overnite.

bolt holes can elongate over several years, from the constant flex.

i've seen it happen on much less load bearing things than a car underbody from constant minor movements

remember, it's not the flanges of the SFC that elongate, it's usually the softer, thinner sheetmetal of the unibody.

 

weld it, you not doing much of anything with the bolt-ons. You will be depending on the strenght of the bolt (and the bolt holes that may distort over time due to the stress) rather than the strenght of the steel. If you have bolt-ons I'd go head and have the tie-down points welded in place. Atleast then you would be geting something out of your investment. It's just my way of thinking, but I think it would be worth doing. I had mine custom made out of 1/8 inch thick square tubing. That baby is solid as a rock!

 

From the several styles,versions that I've seen the bolt on ones are more beefy and usually have extra braces comming off of them.So thats what I went with and did both,bolted and then welded them in. It made the most noticable improvement in the car as far as suspension upgrades go.

 

Square tubing, is that a new style???

 

Tubing : [n] conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct liquids or gases

definition doesn't neccessarily require it to be cylindrical...so yeah "square tubing" is a kind

just messing

for most driving situations, standard 4poiint sfc do a sufficient job of making the unibody rigid. for more serious racing and hp it may by beneficial to go to a double diamond style (6 pt of connection). but these can cause interferance with some exhaust setups and add extra weight.

 

Ok, so what else would you call a hollow tube with four sides Mr. Wizard?!?!

 

No it's not new. Square tubing has been around for a long time.

 

Since it can not be a tube which is circular, Metal stock is called BOXED when it has four sides.

Now the proper terms are Boxed stock & Tube stock in ref to metal fabrication.