Cant comment on the gardner system other than its very expensive! If you dont need 100& correct stock exhaust, the aftermarket kits are very nice or have another exhaust shop bend something up for you... Pypes, dynomax and others sell kits that fit very good and most shops know to not cut the E-brake cable.
HO manifolds aint cheap either, the mentioned kits above offer downpipes to keep the stock exhaust manifolds.
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