Easy enough to do with a sawzall and good blade, I did mine that way, FWIW.

 

Thanks man I was gonna use a cutoff wheel but I like the sawzall idea much better. Cleaner cuts that way. The pipes definitely need this done!

 

Ya me too. I dont trust dynos though lol

 

Me either but before and after on same dyno gives a good idea though.

 

Finally got freed up enough to get the car in the shop & get this badass set of headers on the car. First some pics of the old BBK headers. Still in great shape after 6 years, some surface rust of course.





Ok, the BBKs come apart very easy, prolly had them removed in about 45 minutes, didn't have to remove the plugs or coils.

 

Now the new shiny stuff!


3 inch ORY pipe

OK so these took a lil massaging to get in, R.side had to remove the front 3 plugs & it fell right in

The L. side, not as easy. Removed all plugs, oil filter & had to grind about 1/2 inch off the K member. Not too bad though


Pretty decent clearance though, tuck under the car nice!




As expected, a lil harder to get to the spark plugs

Small problem: Catback I-pipe had to be trimmed about 1.5 inch, tried & tried with a tailpipe cutter 304 stainless is no joke lol! So had to call it a night until I got my hands on a sawzall with an awesome blade. This alone was making me second guess doing the install(mind you I had a similar problem during the BBK install had to have a pipe fabbed at the local muffler shop to fit in the GMMG catback

So got a sawzall & got the pipe cut but had to separate the I-pipe from the mufflers, I-pipe has to connect to ORY then back into the muffler pipe. A lil work & heat but I got it all together this morning. Everything fit pretty good too!
I did cut (2) 1 inch reliefs in all the ORY joints with a cutoff wheel.


Cleaned up the GMMG a lil, it needed it!

 

Ok so how does it sound? I think everyones opinion would be along the lines of fuggin really loud or SLP LM1 loud lol! But IMHO, it is a lil louder but not really much! The sound quality didn't diminish that's for sure, it still sounds great & actually a lil better! I could feel the car pull much harder especially above 60. Some sound clips:
Initial startup & 2k rev: all of the band clamps did leak a lil so went over all after

Driving home getting on it a lil, had some traffic so



Idling, 20 ft from my camera phone. some 4-5k revs

 

Great review thanks so much but did you lose any low end I'm always getting mixed reviews I'm not camed and I have stock heads a lot of people tell I should go 1/34

 

Oh and people said I should go with catted y pipe as well I do got lm1 on it

 

No, low end doesn't feel any different. Headers are 1/8 inch from bellhousing on r side, & 1/8 from k member on L. side. Havent heard anything touching either so that's a plus. Prolly should've ground a lil more off the L. K member. For your mods some 1 3/4 primaries would work great!

So I take it you have stock manifolds? I guess if the potential extra noise an ORY makes bothers ya or if you live in a state that does emission testing but since I don't have to I'm not! A catted Y almost triples the price of the Y pipe, is a restriction & something that could fail & cause a major restriction, running problem.

 

Here's what I did with my TSP 1 7/8" as well as modding my LM1 to actually make it sound GOOD

https://ls1tech.com/forums/generatio...tall-pics.html

https://ls1tech.com/forums/generatio...s-finally.html

And a video of the Magnamouth

 

Dr whigham, I did try to look at your pics of the extra muffler you added to quiet the LM1 but I couldn't see the pics. I'm not adding a thing to mine, sounds perfect! It does have some of the machine gun sound that varies depending on how much throttle is used but that's what its supposed to sound like! Not harsh at all, sounds very clean. Now that could change when I go with a bigger cam I have driven a LM1 car with headers & stock cam(don't recall if it had cats) & it was very loud.

Like ya said, I have poly mounts & not the same issues you had with trimming the floor. I didn't have to remove the starter, steering shaft, jack the motor up to get them in( although when I was trying the L.side I really thought jacking the motor up was gonna be necessary until I trimmed the K member a tad) like I see some others did! I LOLed at lemons12s comment about rather having coated headers over these TSPs cuz they MIGHT fit better

 

Hmmm. It's working for me? Just a Magnaflow 14419. Glad you're happy with it regardless!

 

Yes I have ls6 intake on my car and other mods like Slp ram air Slp air box lid pp tb 160 stat tb bypass black wing air filter Slp loud mouth with power programmer

 

That's all I got so far flint wrench69

 

My first mod was the 1 3/4 LTs I had on there. With the cam & heads I figured it was time to upgrade & that my setup would benefit. After driving it some more today I'm really glad I did cuz it feels like I picked up another 20 hp. I'm gonna have to get it dynoed soon.

 

Heading down to Camaro Superfest tomorrow?

 

No I don't have emissions where I live I live in Iowa so I should go with 1/34 and ory instead of catted y and don't go with 1/78 but letter in the future I might cam it with heads and I know I'm going with yank ss 3600 stall

 

Didnt know its tomorrow, isn't it usually in August? I will be there tommorow