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Old 02-22-2006, 03:52 PM   #1
rocketwrx
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Default Why bother with the springs on the mid-pipe to cat connection?

I understand how it should work, but one thing I noticed in fighting with my SPT exhaust is that the bolts they give you are kind of short, so when you torque them down to where you are supposed to the spring is virtually 100% compressed. There's really no give in it at all. In that case, why bother?
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Old 02-23-2006, 12:13 AM   #2
Uncle Scotty
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...flex.....in the exhaust system.

There are some fools, here, that think---wrongly---that ya don't need a flex in the exhaust system.

Ya need one......prevents cracking...fatigue....premature failure...
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Old 02-23-2006, 02:36 AM   #3
m1ek
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isn't the SPT catback a full 3" catback? if so, then you don't need the stock springs at all. just remove the donut gasket off the downpipe end and im guessing the catback came with some new gaskets, well, use the gaskets and the new bolts to install it on.

the new bolts are shorter because they're not designed for springs. why don't you compare the new bolts with the stockers, see the difference?
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Old 02-23-2006, 04:13 AM   #4
dj_booduh
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I got the turbo xs turbo back, and when I put it up I also noticed that the springs were pretty much fully compressed. Should I loosen them up, or just leave them like they are? I was told to use the stock springs from the instruction sheet that came with the exhaust so. anyone have ny ideas?
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Old 02-23-2006, 07:19 AM   #5
99ways2die
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Yes - use the stock springs as per instructions.
THe same goes for the SPT cat-back (it's also in the instructions).


Quote:
but one thing I noticed in fighting with my SPT exhaust is that the bolts they give you are kind of short,
....one thing to keep in mind:
I installed my SPT with original springs and NEW bolts, as instructed.
After a couple of months of winter, during a DP install, i noticed how quickly the SPT provided bolts where deteriorating.
I switched back to the original bolts.
...and no-the SPT kit does not come with a new donut gasket, why would it.

-99
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Old 02-23-2006, 08:30 AM   #6
rocketwrx
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The damn donut gasket won't stop leaking. I installed the SPT catback, leaked. Tried exhuast sealer on the gasket, leaked.

2 days ago I put on a new donut gasket- still leaks! I don't know what to do now. Its a small leak, but its definately there- at least when cold.

What I'm getting at is that by completely compressing the springs, its seems you've taken all of the flex out of the system (since they are just jammed up against the flange and compressed 100%).
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Old 07-04-2007, 09:13 PM   #7
arm03
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Default Is there an answer?

If anyone still remembers this thread, I just installed a catback today and had the same problem (stock bolts are too short, just barely can get the nuts on with springs totally compressed). I suppose I should just go get some longer ones. I didn't know if they would work themselves loose,and then I'd lose the springs, too. Anyone?
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Old 07-04-2007, 09:53 PM   #8
dibblejr
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You can use the springs on any bolts that they will slip over. Personally on my 3" exhaust I do not have them and havent for 3 years and do not have any leaks. I used all new SS bolts when I installed it.

I have used the stock bolt springs on longer bolts on some of my members cars.

I do not really think they make any difference, its just a matter of choice,

Good luck.
Jay-R
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Old 07-04-2007, 10:19 PM   #9
nhluhr
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Quote:
Originally Posted by Uncle Scotty View Post
There are some fools, here, that think---wrongly---that ya don't need a flex in the exhaust system.
Quote:
Originally Posted by m1ek View Post
isn't the SPT catback a full 3" catback? if so, then you don't need the stock springs at all.
: picard :
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Old 07-05-2007, 10:28 AM   #10
arm03
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Default thanks

Thanks for the info, fellas! I probably would have gotten longer bolts just for peace of mind. Just wasn't sure if I would screw up something further up the system (like shake the downpipe, etc. if no flex). But I appreciate the kind response.
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Old 07-05-2007, 02:18 PM   #11
KPT
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Am i the only one whose stock donut gasket didn't fit into the spt exhaust (not even close), on an sti?

I justed used the wafer gasket from my stock midpipe to axelback.
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Old 07-05-2007, 03:10 PM   #12
sigurd
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Quote:
Originally Posted by arm03 View Post
If anyone still remembers this thread, I just installed a catback today and had the same problem (stock bolts are too short, just barely can get the nuts on with springs totally compressed). I suppose I should just go get some longer ones. I didn't know if they would work themselves loose,and then I'd lose the springs, too. Anyone?
My bolts were a bit too short aswell, go to any parts store that has those "help" brand parts. They have a set of spring bolts that are about 1inch longer than the stock bolts. I wish I remember the part number but I threw the box away. The springs that come with it wont work because there cone shaped but you dont need those anyway. Also you will need a washer thats a bit bigger than the head of the bolt because there a bit small and I was affraid they would suck themselves through the catback hole.

Quote:
Originally Posted by KPT View Post
Am i the only one whose stock donut gasket didn't fit into the spt exhaust (not even close), on an sti?
My stock donut gasket wouldnt fit onto my bosal 3rd cat delete. I got it used so there was nothing on it, I just assumed the stock one fit it. I ended up going to an exhaust shop and they had a donut gasket that fit over the bosal. It was a bit bigger overall and thats why I had to get the longer spring bolts like I sated above.

Last edited by sigurd; 07-05-2007 at 03:17 PM.
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