Identifying Kooks header generation
Thread Starter
Heel & Toe
Joined: Sep 2021
Posts: 20
Likes: 1
Identifying Kooks header generation
I bought a used set of Kooks LT headers that are stepped 1 3/4" to 1 7/8" and I was looking to buy some x pipes for them next. Is there a way to identify if these are their updated or redesigned headers? Or will a new set of x-pipes fit both versions? And I'm trying to prepare for how much of a headache I have during installation because I heard the originals are a PITA 
Thank you all
Thank you all
Melting Slicks
Joined: Dec 2004
Posts: 2,847
Likes: 1,144
From: Sleepy Hollow- NJ
I have an old set of Kooks 1 7/8s mated to an older Kooks off road xpipe and fit was perfect. Thinking the Kooks xpipe of today would mate the same way. Not much to an xpipe design. So if it's Kooks LTs mated to Kooks xpipe you should be good. The design change to the headers from early gen to current changed the install method (from the top or the bottom) but xpipe mounts the same.
You can give Kooks a call to confirm. I've called them for questions and they pick right up.
You can give Kooks a call to confirm. I've called them for questions and they pick right up.
Race Director
Joined: Oct 2004
Posts: 12,864
Likes: 4,667
I bought a used set of Kooks LT headers that are stepped 1 3/4" to 1 7/8" and I was looking to buy some x pipes for them next. Is there a way to identify if these are their updated or redesigned headers? Or will a new set of x-pipes fit both versions? And I'm trying to prepare for how much of a headache I have during installation because I heard the originals are a PITA
Thank you all
Thank you all
Advanced
Joined: Mar 2019
Posts: 76
Likes: 19
From: Rochester, NY
2 bolt flanges where the x pipe meets the exhaust? Or where the header meets the x pipe?
Most Kooks headers ive seen dont have flanges at the header, instead a clamp.
Im looking at some used sets, and trying to determine
Most Kooks headers ive seen dont have flanges at the header, instead a clamp.
Im looking at some used sets, and trying to determine
Race Director
Joined: Oct 2004
Posts: 12,864
Likes: 4,667
Where the header meets X-pipe. On the Kooks C5 headers I've seen, the header collector has a large male/external radiused end, and this mates to a matching female/internal radius on the X-pipe. Then there's 2 tightening plates/collars, 1 on the header, and one on the X-pipe. You put a bolt thru each of the holes, and put a lock washer and nut on the end of the bolt, then tighten the nuts. I've never had an exhaust leak with this setup, ever. I can only relay the info Kooks relayed to me. Perhaps some of the headers you're talking about either weren't Kooks, or they weren't for a C5. IDK, I only know what Kooks told me.
Burning Brakes
Joined: Nov 2021
Posts: 778
Likes: 382
From: Old Dominion - VA
Where the header meets X-pipe. On the Kooks C5 headers I've seen, the header collector has a large male/external radiused end, and this mates to a matching female/internal radius on the X-pipe. Then there's 2 tightening plates/collars, 1 on the header, and one on the X-pipe. You put a bolt thru each of the holes, and put a lock washer and nut on the end of the bolt, then tighten the nuts. I've never had an exhaust leak with this setup, ever. I can only relay the info Kooks relayed to me. Perhaps some of the headers you're talking about either weren't Kooks, or they weren't for a C5. IDK, I only know what Kooks told me.
Race Director
Joined: Oct 2004
Posts: 12,864
Likes: 4,667
Race Director
Joined: Oct 2004
Posts: 12,864
Likes: 4,667
Old Kooks instructions.......
I bought a used set of Kooks LT headers that are stepped 1 3/4" to 1 7/8" and I was looking to buy some x pipes for them next. Is there a way to identify if these are their updated or redesigned headers? Or will a new set of x-pipes fit both versions? And I'm trying to prepare for how much of a headache I have during installation because I heard the originals are a PITA
Thank you all
Thank you all
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