Exhaust interchangeability

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I have a completely stock 1986 Grand Prix. I just purchased a Walker factory replacement 442 exhaust system. Will this system designed for a 307 bolt up to my stock 305 with little to no issue? I realize I'll need a hangar for the driver side tail pipe, I'm just hoping everything else will fit. I appreciate anyone who has direct knowledge to reply. Thanks!

 

[olds307 and 403]

I believe the 307 uses a different converter, otherwise from there back will work fine.

 

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I bought the y pipe back. My concern is whether or not the y pipe will bolt up to both converters, and whether or not the cat on the olds ends exactly at the same spot as the GP cat.

 

[jerry455]

I used a Hooker cat back exhaust on my Grand Prix but I found a Monte SS head pipe and converter in a boneyard. I think the GN had the same outlet on the converter. The olds flange is a 2 bolt with a ball socket while the Monte and GN have a larger oval 4 bolt flange.

 

[pic18]

So I figured I'd share my experience for future googlers. I do not know if the catalytic converter on my car is the original or not, but I believe it is. The back side of it has the ball shaped flange. The walker exhaust I purchased for an Olds 442 bolted right up to the cat. Everything fit perfectly on my Grand Prix with the factory 305. The exhaust shop had to fabricate some hangers to bolt up to the correct spot on the tailpipes. The exhaust has a deep mellow sound. It's not too loud, but it would make you think I had more than 140 hp!