I had zero issues with that part of the installation on my 1977 with Hooker headers. My moderate issues were with the crappy looking multi-piece tailpipes used with the splitters on the transverse mounted muffler, and the poor rear axle brake hose and hard steel fuel line clearance with the drivers side mid pipe. The only positives I will give the system is the tucked up appearance, the quality of the header flange pipes, and the sound quality. The system with two mufflers might not have these issues.
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey
1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles
2017 Sierra SLT 1500 Z71 4X4 
2019 Canyon SLT Crew 4X4 
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