Lots of penetrating fluid like Liquid Wrench or PB Blaster. Soak it all night, maybe all day too. If that doesn't work I've heard that you sometimes will have luck if you heat the nuts up first with a torch, although I've never had to resort to this.
When I dropped an A340e, I believe I did drop most of the exhaust (actually, I think it was everything from the manifold back). You won't have to drop it all like I did, I just did it because it was simple enough and that kept it all in one piece.
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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