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I'd still call a turbo kit a bolt on, if it's a kit. If fabrication is required etc. It is no longer a bolt on IMHO.
If the engine needs to be cracked open it's no longer a bolt in either. if the sump needs drilling, no longer bolt in. If the sump needs replacing, borderline but I'd still call it bolt in.
Tuning has little to do with it IMHO. Coilovers are bolt in but should have a wheel alignment done. Same thing.
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