I got my magnaflow yesterday and went to install it today and i cannot get the damn bolts off from the cat. Frozen (rusted) shut. I doused it in wd40 and penetrating oil but still no help. Any suggestions? i'm sure you guys have had this problem before, i hear everyone does. I'm going to try a can of PB Blaster tomorrow. I hit the bolts with a hammer a bunch of times to loosen it up, i've tried everything. If the PB blaster doesnt work i guess i'm goin to an exhaust shop to get it loosened....

 

heat it up w/ a torch

 

Jack up vech, Get a cheater/breaker bar

 

try this before you try heating it...i really don't like torching my vehicle. Just my opinion

 

i always run into those problem when i work on my car!! Let me give u couple of options!!!
1. use a air tool.
2. use bigger tool
3. keep it stock ^^

 

let me just recommend that you don't use a torch on it when it has WD40 on it.... just a suggestion.... you know, if you like having hair and eyebrows.

 

corroded bolts are going to round right out once you put a breaker bar on them. Youre either going to a shop or youre getting new hardware and cutting the old off with a dremel.

 

 

PB blaster totally pwns wd40. definately worth the cost. then follow the advice above.

 

big pipe

 

Sometimes it takes alot of torque to get those off.

 

I usually give exhaust bolts 5 minute of my time, then I just cut and replace, course I always have new bolts handy to put on.

 

To get mines off i sprayed it with wd-40 let it sit for around ten minutes then put a ratchet wioth a 1 foot breaker bar and just kicked the hell out of it. Still was a b*tch to come off but it gave eventually.

 

Thanks for the hints. I get to look forward to this next weekend when I get my cat back put on. I am also considering not driving my car a day before I do this. Hit the day before with pb blaster and 15 minutes before I try and get those bolts out.

Also, what size are those nuts and bolts? I am going to go buy new ones tonight unless someone can tell me if the Greddy cat back comes with new hardware.

 

Just get a good angle grinder with a cutting wheel. Takes care of any bolt, and usually those exhaust bolts are so rusted you wouldnt want to reuse them anyway, so why not just cut them.